2024-03-29T01:36:40Z
https://jcaa.caa-aca.ca/index.php/jcaa/oai
oai:jcaa.caa-aca.ca:article/353
2012-12-26T19:24:53Z
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Industrial Noise Legislation in Canada, 1972
Langford, William H.
Canadian Acoustical Association / Association canadienne d'acoustique
1973-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/353
Canadian Acoustics; Vol. 1 No. 1 (1973)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/354
2012-12-26T19:24:53Z
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Services Provided by the National Science Library
Gaffney, Inez M.
Canadian Acoustical Association / Association canadienne d'acoustique
1973-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/354
Canadian Acoustics; Vol. 1 No. 1 (1973)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/362
2012-12-26T19:24:57Z
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Acoustics at CRIQ
May, Daryl
Crepeau, Gilles
Canadian Acoustical Association / Association canadienne d'acoustique
1973-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/362
Canadian Acoustics; Vol. 1 No. 3 (1973)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/363
2012-12-26T19:24:58Z
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Certificats de Mesures Acoustiques au C.R.I.Q.
Crepeau, Gilles
Centre de Recherche Industrielle du Québec 572, avenue Orly, c.p. 2090, Dorval 780, Québec
May, Daryl
Centre de Recherche Industrielle du Québec 572, avenue Orly, c.p. 2090, Dorval 780, Québec
Canadian Acoustical Association / Association canadienne d'acoustique
1973-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/363
Canadian Acoustics; Vol. 1 No. 3 (1973)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/364
2012-12-26T19:24:59Z
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A Summary of the Ontario Provincial Noise Program 1973/1974
Benwell, D.
Noise Pollution Control Section, Air Management Branch, Ministry of the Environment, 880 Bay Street, Toronto, Ontario. M5S 1Z8
To successfully control and abate environmental noise, all levels of government should participate with short and long-range programs. The Federal government could limit the noise potential of all kinds of devices at the manufacturing level. The Provincial government could limit the operation of noises of these devices to assure that they are maintained and operated in the proper way, and enforce sensible land-use practices in the vicinity of high noise-level sources. The Municipal government can deal with the local problem of nuisance noises, and assist with enforcement of provincial legislation.
Canadian Acoustical Association / Association canadienne d'acoustique
1973-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/364
Canadian Acoustics; Vol. 1 No. 4 (1973)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/365
2012-12-26T19:41:17Z
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Airport Noise: Perspectives from a Regulatory Agency
Filotas, L. T.
Civil Aviation Planning & Research, Ministry of Transport, Ottawa, Ontario K1A 0N5
Most readers will be familiar with charts listing 'typical' noise levels associated with common activities. After attributing the lowest level to some innocuous source - perhaps 'rustling of leaves' - this kind of list will climb through a succession of items such as 'normal conversation', 'home appliances' and 'automobile horns'. And the chief villain topping the list? Almost certainly the jet airplane. As chief regulator of this putative chief villain, the Civil Aeronautics Branch of the Ministry of Transport is the government agency most directly concerned with aircraft noise control and bears the brunt of the public's often vociferous complaints. Despite stiff competition disputing the jet's community noise championship - notably from road traffic - there seems little doubt that airplanes generate the loudest levels involuntarily experienced by many people. At any rate, many of our larger airport's neighbours are disturbed deeply enough to devote considerable time to lobby against this unfortunate adjunct of the jet age. Accordingly, and quite properly, noise control is becoming increasingly predominant in airport planning and operations. This article examines - informally, from a working level perspective in a federal regulatory agency - some aspects of airport noise: in particular, it reviews the MOT's current practices and future hopes.
Canadian Acoustical Association / Association canadienne d'acoustique
1974-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/365
Canadian Acoustics; Vol. 2 No. 1 (1974)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/366
2012-12-26T19:41:18Z
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The University of Calgary Acoustics Group
Jones, H.
Department of Physics, University of Calgary Calgary 44, Alberta
Work in acoustics at the University of Calgary is spread widely through the University and is actively pursued in two faculties, Engineering and Arts and Science, with an interest being taken in the subject by two others, Medicine and Environmental Design. The interest and activity in the area appears to be increasing and the number of co-operative projects between the different individuals involved is also increasing. There is sufficient interest in active liaison between the different individuals for the suggestion of the creation of a University of Calgary Acoustics Group to be considered seriously. Recognition of a common bond would be implied by the title and the existence of the Group should further the provision of more joint courses in basic topics in the subject at approximately graduate level. The present and immediately projected work in acoustics is listed (in abstract form).
Canadian Acoustical Association / Association canadienne d'acoustique
1974-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/366
Canadian Acoustics; Vol. 2 No. 1 (1974)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/367
2012-12-26T19:41:19Z
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Motor Vehicle Noise Programmes in the Ministry of Transport
Welbourne, E. R.
Under the authority of the Motor Vehicle Safety Act, the Road and Motor Vehicle Traffic Safety Branch develops and enforces the Canada Motor Vehicle Safety Standards (CMVSS). In addition to the more obviously safety-related aspects of vehicle design and performance, these standards cover gaseous pollutant emissions and noise. The Branch also conducts an applied research programme which, while primarily concerned with the mainstream of traffic safety problems, usually includes two or three vehicle noise projects. This note outlines the current and proposed future activities of the Branch in standards development, enforcement and applied research relating to motor vehicle noise.
Canadian Acoustical Association / Association canadienne d'acoustique
1974-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/367
Canadian Acoustics; Vol. 2 No. 2 (1974)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/368
2012-12-26T19:41:19Z
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"740701 1974 eng "
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Ontario's Vehicle Noise Programme
May, D. N.
Canadian Acoustical Association / Association canadienne d'acoustique
1974-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/368
Canadian Acoustics; Vol. 2 No. 3 (1974)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/369
2012-12-26T19:41:19Z
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Report Abstract: Noise Propagation Near Vancouver International Airport
Piercy, J. E.
Embleton, T.F. W.
Canadian Acoustical Association / Association canadienne d'acoustique
1974-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/369
Canadian Acoustics; Vol. 2 No. 3 (1974)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/371
2012-12-26T19:41:20Z
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Whale Acoustics
Beamish, Peter
Department of Environment Fisheries and Marine Service, Marine Ecology Laboratory, Dartmouth, Nova Scotia
Hydrophone arrays have been used to record repetative sound pulses of less than a few milliseconds duration from a fin, a humpback and a blue whale. The blue whale, temporarily entrapped by ice, emitted the acoustic signals into the water from the anterior portion of its 4 meter upper jaw. The front half of this jaw is devoid of air cavities and moving muscles, hence it is unlikely that the sounds are produced there. This data, therefore, suggests that the upper jaw is an acoustic wave guide. These signals, recorded on three hydrophones at ranges 5-10 meters from the animal, as well as signals from the free swimming fin whale, recorded at ranges 10-20 meters from the animal, indicate the following peculiar directional property of the sounds. The low frequencies are beamed forward, the higher frequencies to the sides.
Canadian Acoustical Association / Association canadienne d'acoustique
1974-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/371
Canadian Acoustics; Vol. 2 No. 4 (1974)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/372
2012-12-26T19:41:21Z
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Environmental Noise Research and Government Funding
Strosher, M. M.
Lack, J. C.
The purpose of this article was to review the various Canadian funding mechanisms and sources available to the environmental noise researcher. At the same time, the extent of environmental noise research in Canada would be realized. Once the information from the various government agencies had been gathered and reviewed, it became apparent that there are two types of funding mechanisms available: (1) general objective research, (2) specific objective research. Generally speaking, each mechanism is geared towards a specific type of noise research, the results of which are not often applicable to the objectives or goals of the "other" mechanism. In other words, a strong co-ordinated effort does not exist between the two means of funding.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/372
Canadian Acoustics; Vol. 3 No. 1 (1975)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/373
2012-12-26T19:41:22Z
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Privacy Prediction in Landscaped Offices
Strachan, R. A.
This is an abbreviated version of a 13 page report plus 26 pages of appendix, presented at the Canadian Acoustical Association 1974 Symposium, Edmonton, Alberta by the author.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/373
Canadian Acoustics; Vol. 3 No. 2 (1975)
eng
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oai:jcaa.caa-aca.ca:article/374
2012-12-26T19:41:22Z
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Ontario Model Municipal Noise Control By-Law
Manuel, J.
Last Fall, the Ontario Minister of the Environment announced the preparation of a Model Municipal Noise Control By-Law which would permit municipalities to meet their expressed wishes to control local noise. Because authority under The Ontario Municipal Act limited the scope of noise control by-laws that municipalities could enact, he introduced an amendment to The Environmental Protection Act which will permit municipalities to adopt appropriate noise control measures. The Bill has received Royal Assent and a Model. Municipal Noise Control By-Law has been drafted for review by, and discussion with, municipalities.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/374
Canadian Acoustics; Vol. 3 No. 2 (1975)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/375
2012-12-26T19:41:23Z
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Noise Pollution - What Can Be Done?
Shaw, E.A. G.
Editor's Note: The following article "Noise Pollution - What can be done?" originally appeared in PHYSICS TODAY, Vol. 28, No. 1, January 1975. PHYSICS TODAY is published by the American Institute of Physics, the parent orginization of several Societies including the Acoustical Society of America. Because of the great interest in this subject and the timeliness of this article, its author sought and was granted permission to reprint it as part of this issue of Acoustics and Noise Control in Canada. We are very pleased to acknowledge this generous permission from the Editors of PHYSICS TODAY.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/375
Canadian Acoustics; Vol. 3 No. 2 (1975)
eng
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oai:jcaa.caa-aca.ca:article/376
2012-12-26T19:41:26Z
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Restoration and Selection Processes In Listening to Sentences With Phonemes Deleted
Kennedy, J. M.
Scarborough College, Toronto
Chattaway, L. D.
Scarborough College, Toronto
Chattaway, E.
Scarborough College, Toronto
Summary of a paper presented at the Canadian Acoustical Association
Conference, Edmonton, 1974.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/376
Canadian Acoustics; Vol. 3 No. 3 (1975)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/377
2012-12-26T19:41:26Z
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Fish Diversion by Underwater Sound at Discrete Frequencies
Buxcey, S.
Ontario Hydro has been experiencing some difficulties at Thermal Generating Stations due to fish entering the cooling water intakes and passing through the screens in sufficient numbers to clog cooling tubes. Since these fish tend to be of the same species and size, e.g. alewife schools, it appears possible that sound at a discrete frequency, possibly resonant, might prove a deterrent to their entrance and reduce their effect on plant performance. Therefore funds were made available for the research projects which are described briefly below.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/377
Canadian Acoustics; Vol. 3 No. 3 (1975)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/378
2012-12-26T19:41:26Z
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Auditory Acuity of the Native Population at Igloolik, Keewatin, N.W.T.
Cummings, T.
Dept, of Preventive Medicine § Biostatistics, University of Toronto
Brown, J. R.
Dept, of Preventive Medicine § Biostatistics, University of Toronto
The use of snowmobiles on a routine basis by Eskimo hunters has led to some concern regarding potential risk to hearing. Noise levels of snowmobiles were measured, under representative operating field conditions. Audiograms of hunters and of the general native population were obtained. Composite audiograms were prepared. Preliminary results indicate that: (a) the general native population presents a normal response pattern (b) the Eskimo hunters demonstrate a typical noise induced pattern of hearing loss.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/378
Canadian Acoustics; Vol. 3 No. 3 (1975)
eng
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oai:jcaa.caa-aca.ca:article/380
2012-12-26T19:41:27Z
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Scattering of Sound Used to Study the Atmospheric Boundary Layer
Bennett, Richard C.
List, Roland
We are using the scattering of sound for the remote sensing of thermal turbulence in the atmosphere. Over the past several years an acoustic radar has been developed and operated at the University of Toronto to study the planetary boundary layer. We were one of the first groups to operate successfully in a noisy urban environment. A brief outline of the concept and technique of acoustic echo sounding will be given along with a discussion of some of our observations. In the past, the study of the planetary boundary layer (50 m — 1 km) of the atmosphere has been limited by the lack of access with direct access being limited to occasional baloon ascents or airplane traverses and in a few cases, to instrumented towers extending beyond 100 m. Recent advances in remote sensing techniques now allow us to remotely monitor parameters of the boundary layer on a continuous real time basis. Acoustic radar, FM-CW radar and lidar (laser radar) are the three techniques being most actively investigated and applied.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/380
Canadian Acoustics; Vol. 3 No. 4 (1975)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/381
2012-12-26T19:41:28Z
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Noise Level/Attitudinal Surveys of London & Woodstock, Ontario
Foreman, J.E. K.
Dickinson, S. M.
Emmerson, M. A.
Physical and attitudinal surveys of community noise levels in the cities of London and Woodstock, Ontario, Canada were conducted. The noise monitoring, data retrieval, and data processing systems are described. A summary and discussion of the survey results are presented as a basis for the establishment of community noise regulations.
Canadian Acoustical Association / Association canadienne d'acoustique
1975-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/381
Canadian Acoustics; Vol. 3 No. 4 (1975)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/382
2012-12-26T19:41:29Z
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Criteria for Airborne Sound Insulation Between Dwellings
Northwood, T. D.
Noise and Vibrations Section, Division of Building Research, National Research Council of Canada, Ottawa, K1A 0R6
Experience indicates that the most disturbing of intrusive sounds in apartment dwellings are voices, either live or by way of radio or television. Closely related are other airborne sounds including music reproduced on radio, TV or stereo. Next on the list are impact sounds including slamming of doors and footsteps on the floor adjacent or above. Finally there are mechanical or plumbing noises. All of these need consideration, but only the first topic, insulation against airborne sounds, is considered here.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/382
Canadian Acoustics; Vol. 4 No. 1 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/383
2012-12-26T19:41:30Z
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"760101 1976 eng "
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Predicting Community Response to Surface Transportation Noise
Hall, Fred L.
McMaster University
Taylor, S. Martin
McMaster University
The purpose of this paper is to identify a means for predicting, for residential neighbourhoods, the percentage of the population likely to be disturbed by any given transportation noise environment. The equation to be developed will depend only on those characteristics of the noise environment which can be predicted with the present state of the art. The reason for this is that the most fruitful applications of such an equation are in predicting the impact of possible future actions. For existing situations, it is almost as simple to survey personal reactions as it is to monitor noise levels. The paper focuses on residential neighbourhood noise resulting primarily from ground transportation systems. This means noise caused by expressways, arterial roads, rail lines, and combinations of these. In an attempt to determine whether reliable predictions can be made without reference to the specific noise source (given that it is a ground transportation source), this paper will report results based on sites representing all of the sources. It is expected that subsequent work will test these general findings on larger, source specific data sets.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/383
Canadian Acoustics; Vol. 4 No. 1 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/384
2012-12-26T19:41:31Z
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Noise Control in Alberta
Jones, H. W.
Physics Dept., University of Calgary
The Provincial and Municipal Governments of Alberta have attempted a variety of measures for the abatment and control of environmental noise. The origins, contents and effectiveness of the measures are outlined and commented on. Several major studies have and are being conducted by both levels of government in their attempts to improve their ability to deal with these problems. This work is described in outline and the special difficulties related to the conduct of this work because of the lack of sufficient professionally trained man-power will be described. The difficulties of finding the appropriate solutions to particular problems especially in regard to urban planning, economic impact and the fostering of good public relations is discussed by reference to the role of the acoustician in a multi-discipline team. The problems which exist for Municipal and Provincial Governments because of the presently inadequate national regulations relating to some aspects of noise control is also discussed.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/384
Canadian Acoustics; Vol. 4 No. 1 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/385
2012-12-26T19:41:32Z
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Modelling Applied to Environmental Acoustics
Jones, H. W.
Physics Department, University of Calgary
Vermeulen, P. J.
MechanicaI Engineering Department, University of Calgary
This paper outlines a literature review which has been conducted; the review indicates that modelling probably will be a useful and successful technique. The application of scaling laws to the problem have been reviewed and commented on. The need for a thorough and careful approach to the problem in which all the material properties are measured and in which a controlled sound source is employed appears to be indicated. The development of a well-controlled high frequency source is described, together with some description of the first measurements of material properties. Experience to date indicates that modelling should provide a low cost method for obtaining solutions to propagation problems.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/385
Canadian Acoustics; Vol. 4 No. 1 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/386
2012-12-26T19:41:32Z
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"760401 1976 eng "
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Sound Propogation Outdoors
Embleton, T. F.W.
Division of Physics, National Research Council Ottawa, Ontario K1A 0S1
Piercy, J. E.
Division of Physics, National Research Council Ottawa, Ontario K1A 0S1
Olson, N.
Division of Physics, National Research Council Ottawa, Ontario K1A 0S1
In problems of sound propagation outdoors it is usually assumed that the ground is infinitely hard, and that sound from a point source spreads in the space above the ground according to the inverse square law. At large distances molecular absorption plays a significant role. Because sound levels at ranges greater than a few hundred feet are often 10 or 15 dB less than expected, from the mechanisms so far mentioned, sound levels are often reduced empirically by this amount in prediction schemes and attributed to a "terrain effect", or some such name. Meteorological effects, caused by gradients of wind or temperature are more difficult to allow for, and are often ignored. These gradients and related instabilities also result in turbulence, which causes fluctuations in the sound levels that are quite significant, depending on sound frequency, even a few hundred feet from the source. There is much relevant material in the technical literature that has not yet been applied to the practical problems of outdoor sound propagation; but which can be very significant for such things as the standard testing of motor vehicles or snowmobiles at ranges of 25 or 50 feet, and at longer ranges are important for the prediction of airport or highway noise at distances of a mile or two. Precise mathematical theory of wave propagation in near-horizontal directions over a surface of finite impedance goes back to Sommerfeld in 1909 and was extensively developed by about 1940 at least for electromagnetic waves. The theory was put into acoustical form about 1950 by both Ingard and Rudnick, and the latter also confirmed the main features experimentally in the laboratory. In the last twenty years there have been several experimental studies outdoors, whose principal strength has been the careful reporting of results rather than the discussion of mechanisms. The reasons most of this is not yet applied are twofold: firstly the scarcity of measurements of ground impedance particularly for the near-grazing angles of incidence that are of practical importance; and secondly the complexity caused by several phenomena that usually coexist, although sometimes one or another can predominate. This paper briefly summarizes some of this un-applied experimental knowledge, with a view to replacing parts of the present widely used empirical prediction methods by more quantitative schemes.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/386
Canadian Acoustics; Vol. 4 No. 2 (1976)
eng
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oai:jcaa.caa-aca.ca:article/387
2012-12-26T19:41:33Z
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A Noise Enclosure for a Residential, Central Air-Conditioning Unit
May, D. N.
Ministry of Transportation and Communications, 1201 Wilson Avenue, Downsview, Ontario M3M 1J8
Air conditioners are the most complained of noise source in Ontario and one of the most complained-of in the rest of Canada and the U.S. This paper reports on the construction of a lowcost demonstration noise enclosure on a central air-conditioning condenser unit, the first step in a program intended to result in a do-it-yourself brochure for home handymen and others.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/387
Canadian Acoustics; Vol. 4 No. 2 (1976)
eng
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oai:jcaa.caa-aca.ca:article/388
2012-12-26T19:41:33Z
jcaa:ART
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Criteria and Limits for Wayside Noise from Trains
May, D. N.
Ministry of Transportation and Communications, 1201 Wilson Avenue, Downsview, Ontario M3M 1J8
There has been comparatively little study of train noise acceptability. This paper reviews state-of-the-art knowledge on the subject, and suggests criteria in terms of Leq.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/388
Canadian Acoustics; Vol. 4 No. 2 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/389
2012-12-26T19:41:33Z
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"760401 1976 eng "
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An Investigation of the Subjective Response of Occupants to Interior Car Noise
Dickinson, S. M.
Faculty of Engineering Science, The University of Western Ontario, London, Ontario N6A 5B9
The work described in this paper represents a continuation of a project initiated by the Vehicle Research Group of Ford Motor Company, England, the long term objective of which was to arrive at a means of predicting subjective response to interior car noise from objective measurements.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/389
Canadian Acoustics; Vol. 4 No. 2 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/390
2012-12-26T19:41:34Z
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"760401 1976 eng "
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dc
Nanosecond Acoustic Strain Pulses from CdS Phonon Masers
Smeaton, M. D.
Department of Physics, University of British Columbia Vancouver, B.C., Canada
Hughes, R. C.
Department of Physics, University of British Columbia Vancouver, B.C., Canada
Vrba, J.
Department of Physics, University of British Columbia Vancouver, B.C., Canada
Haering, R. R.
Department of Physics, University of British Columbia Vancouver, B.C., Canada
Observations of nanosecond strain pulses generated by a mode-locked CdS phonon maser are reported. Peak strains exceeding 5x10~5 have been measured. An analogy is drawn between the observed mode-locked operation and a repetitive pulse generator.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/390
Canadian Acoustics; Vol. 4 No. 2 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/391
2012-12-26T19:41:35Z
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"760401 1976 eng "
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Amplitude and Loudness: A Scaling Problem
Dunn, Bruce E.
Department of Psychology, University of Calgary
The article discusses the relationship of the decibel scale to good scaling procedures. It points out the initial utility of such a scale for problems such as power loss in transmission lines. However, the point is made that when the decibel is used for purposes related to such variables as hearing loss and annoyance the scale properties of the decibel change due to the nature of the underlying variable. Certain problems exist when the decibel is used without taking into account the nature of these changes. Some implications of the power law relationship between sound and psychophysiological variables are discussed.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/391
Canadian Acoustics; Vol. 4 No. 2 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/392
2012-12-26T19:41:35Z
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"760701 1976 eng "
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The Speed of Sound in Water
Maunsell, C. D.
Atlantic Oceanographic Laboratory, Bedford Institute of Oceanography, Dartmouth, N.S.
The introduction of the echo sounder into routine hydrographic surveying, replacing dependence on use of the lead line, produced a major change. It must be remembered that a sounder actually registers a time interval and that the speed of sound must be known to convert the time to depth. The International Hydrographic Bureau resolved that 1500 metres per second should be adopted as a standard velocity. Most Canadian waters are cold enough that this causes an overestimate and for calibration the value of 1463 metres per second (800 fathoms per second) is frequently used. Since fresh water has to have a temperature of 14.2°C before this speed is attained most soundings in deep lakes will be overestimated with this calibration. The velocity of sound in water depends upon temperature, concentration of dissolved constituents (for which salinity is the conventional quantity in oceanography) and pressure. The actual value at a given location and time may be evaluated by use of one of the procedures reviewed in this paper.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/392
Canadian Acoustics; Vol. 4 No. 3 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/393
2012-12-26T19:41:36Z
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"760701 1976 eng "
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A New Acoustic Test Facility in Western Canada Part A, The Facility and Its Justification
Bolstad, E. H.
Bolstad Engineering Associates Ltd., Box 5768, Station "L", Edmonton, Alberta T6C 4G2
Critical to our work in corrective acoustics and the development of custom noise barriers, etc., is the need to know how well a proposed design will actually perform before large expenditures are made. In the earlier years of our practice we used the usual devices of borrowing space in a gymnasium, shop, or other available facility to conduct tests in conditions simulating the job site. The results of course had to be judged in the light of known deficiencies in the testing procedure. It was also very apparent to us that there were a number of manufacturers of building materials, wall systems, machinery and equipment, etc. in Western Canada who were not able to provide adequate acoustical ratings on their products because the cost and inconvenience of testing at distant laboratories was prohibitive. For these reasons, we decided, in 1972, to start construction of a full scale test laboratory.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/393
Canadian Acoustics; Vol. 4 No. 3 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/394
2012-12-26T19:41:36Z
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"760701 1976 eng "
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A New Acoustic Test Facility in Western Canada, Part B Technical Evaluation
Faulkner, M. G.
Dept, of Mechanical Engineering, University of Alberta, Edmonton, Alberta
Olynyk, D.
Acoustician No. 22, 9740 - 62 Street Edmonton, Alberta
A new acoustic test facility has just been completed by Bolstad Engineering Associates Ltd. at 6720 - 30 St., Edmonton, Alberta. The facility, consisting essentially of a pair of reverberation rooms with associated electronic instrumentation, is the first full scale acoustical test facility in Western Canada. The purpose of this article is to describe the evaluation of this facility for making laboratory measurements of sound absorption, sound transmission loss and sound power.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/394
Canadian Acoustics; Vol. 4 No. 3 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/395
2012-12-26T19:41:37Z
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"761001 1976 eng "
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The Assessment of Annoyance Due to Train Noise
Hemingway, J. R.
Noise Pollution Control Section, Pollution Control Branch Ministry of the Environment, Ontario
To fulfill the need for an assessment scale for determination of annoyance due to train noise a project was instituted the Noise Pollution Control Section of the Ministry of the Environment and financed throught the Experience '75 scheme. The objectives of the project, as relevant to this paper, were to perform noise measurements at various sites close to railway tracks in the Metro Toronto area; to analyze these noise measurements on a day, evening and night basis to yield different statistical parameters and also train parameters such as audible train duration; to perform interviews with people living close to the monitoring locations; to correlate the noise descriptors with the sociological survey results; to choose the most appropriate noise descriptor and finally to construct a train noise annoyance rating scale based on this noise descriptor. The overall objectives of the project were wide and not confined to the investigation of train noise annoyance. Much socio-economic data were obtained as well as information on the assessment of other noise sources. This report will be concerned only with the train noise aspects of the project.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/395
Canadian Acoustics; Vol. 4 No. 4 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/396
2012-12-26T19:41:37Z
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"761001 1976 eng "
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Development of a Model for Predicting Train Pass-By Noise Profiles
Hemingway, J. R.
Noise Pollution Control Section, Pollution Control Branch Ministry of the Environment, Ontario
A semi-empirical train noise pass- by profile model was developed. The locomotive and wheel-rail noises were first considered theoretically as point and line sources respectively. Practical measurements in the field supplied the necessary level information of locomotive and wheel-rail noise for insertion into the theoretical model.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/396
Canadian Acoustics; Vol. 4 No. 4 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/397
2012-12-26T19:41:37Z
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"761001 1976 eng "
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An Investigation of Railroad Car Retarder Squeal
Faulkner, M. G.
Dept, of Mechanical Engineering University of Alberta Edmonton, Alberta. T6G 2G8
Mioduchowski, A.
Dept, of Mechanical Engineering University of Alberta Edmonton, Alberta. T6G 2G8
While the use of humpyards for the classification of railroad cars has been very effective in increasing the volume of cars handled in a yard, one unpleasant by-product of this system is the squeal which is often generated by the retarder systems. As the cars roll down an incline (the "hump") they are slowed by means of a retarder system which usually is two braking mechanisms. These clamp onto the wheels of the car as it passes. The initial retarder, called the master, begins to slow the cars while the second is one of the group retarders. Figure 1 shows three of the group retarders as well as the classification tracks at the CNR Calder Yard in Edmonton. For certain cars (usually the heavier ones) the retarder brake acting on the car wheels causes a high pitched squeal to be generated. The retarders must dissipate energy at rates of up to 400 kW (>500 HP) and even if a relatively small amount is converted to acoustic power high sound pressure levels can result. Levels of approximately 120dB have been recorded at distances of 100 feet from the retarder. Since most of the acoustic energy is in the 2000-4000 Hz range the squeal tends to be very annoying. Because of the relatively high frequency of the squeal the use of barriers to control the noise seems an obvious answer. While barriers as low as six feet in height have been shown to be effective the practical limit to the insertion loss is about 25 dB. However, this is not sufficient as areas surrounding the retarders can still be severely impacted by the squeals. For this reason alternate techniques which would reduce the noise further have and are being sought.
Canadian Acoustical Association / Association canadienne d'acoustique
1976-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/397
Canadian Acoustics; Vol. 4 No. 4 (1976)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/399
2012-12-26T19:41:39Z
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"770101 1977 eng "
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Predicting L10, L50 and Leq for Urban Traffic Noise
Bradley, J. S.
Faculty of Engineering Science, The University of Western Ontario, London, Canada
The work reported here is a small part of a larger project that has been carried out over the past two summers with the aid of students working on Ontario Experience ’75 and ’76 grants. The problem of predicting urban traffic noise levels breaks down naturally into two parts: (a) the prediction of levels close to the road and (b) the complex propagation of the traffic noise in an urban environment. Work on the propagation part of the problem has shown that simple methods such as "so many dB per row of houses" are inadeguate, and point by point diffraction calculations for both the vertical and horizontal edges of buildings have been combined with the results of a computer ray tracing programme to predict attenuations due to arrays of apartments and townhouses. Results seem very promising, but are not yet complete. Therefore, the work reported here is limited to the problem of predicting levels close to the road.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/399
Canadian Acoustics; Vol. 5 No. 1 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/400
2012-12-26T19:41:40Z
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"770101 1977 eng "
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Visual Display of Sound Waves in Two-Dimensional Models
Barss, W. M.
Department of Physics, University of Victoria
Bernard, J. E.
Department of Physics, University of Victoria
Graham, I. S.
Department of Physics, University of Victoria
At the British Acoustical Society meeting in Loughborough, England, in 1972, there was a demonstration in which the passage of an ultrasonic pulse through water was made visible by a schlieren system using Ronchi grids. That system was used to display the effect of submerged sections of pipes or other shapes on the reflection and transmission of underwater sound. The present project was devised to apply the same principles to display the reflection of sound from the surfaces of an auditorium, using either air or water as the propagation medium in the model. Such a display, which can illustrate focussing effects and excessive delays between arrivals of direct and reflected sound waves, was desired for demonstrations in connection with a proposed course in architectural acoustics and for testing models of halls designed by local architects for the University or other clients.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/400
Canadian Acoustics; Vol. 5 No. 1 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/401
2012-12-26T19:41:40Z
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"770101 1977 eng "
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Noise - The Third Pollution: Suggested Guidelines for Action Now
Blake, D.H. R.
MacMillan Bloedel Ltd., 1075 West Georgia Street Vancouver, B.C.
One of the things that sets man ahead of other animals is that he is supposed to learn faster from his mistakes. In the case of the first two pollutions, those of air and water, premature regulations enforced by Governments caused a waste of millions of dollars because new technologies with more positive, more economic solutions were on the horizon. Perhaps in recognition of this, Governments in the United States and Canada appear bogged down in coming to grips with firm regulations on noise. None of us, I am sure, would like to repeat the classic errors of the automotive industry that: - reduced some pollutants to within limits, but simultaneously introduced new toxics at the same time, and also greatly increased our consumption of dwindling petroleum. Lo and behold! We now have broken new frontiers with lean-burn engines and smaller cars which are economic logical answers to thinking citizens who recognize that we live beyond our energy supply. In spite of squabbles over: - 85 dBA vs 90 dBA, all known technology applied against practical technology, administrative controls or not, economic impact against union demands for removal of the need for hearing protection regardless of cost; industry must continue to move toward prevention of noise induced hearing loss of its employees by enforcement of hearing protectors and the elimination of noise in a logical economically feasible manner.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/401
Canadian Acoustics; Vol. 5 No. 1 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/402
2012-12-26T19:41:40Z
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"770101 1977 eng "
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A Multi-Channel Digital Noise Measuring Apparatus for the Measurement of Noise Propagation
Jones, H. W.
Acoustics Group, The University of Calgary Calgary, Alberta, Canada, T2N 1N4
Babott, F.
Acoustics Group, The University of Calgary Calgary, Alberta, Canada, T2N 1N4
This paper describes a multi-channel system designed to make simultaneous measurements at up to six widely spaced points. The apparatus was used to determine the attenuation of traffic noise as it propagated over various forms of terrain in urban communities. The method of data acquisition, digital coding, interfacing and subsequent computational treatment to obtain any of the A weighted statistical properties of the noise is described. The use of the instrument as a long term (24 hours) survey meter is described. Calibration methods are outlined.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/402
Canadian Acoustics; Vol. 5 No. 1 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/403
2012-12-26T19:41:41Z
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"770401 1977 eng "
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The Regulation of Noise
Crawford, William M.
Industrial Hygiene Department Workers' Compensation Board of B.C.
Informative data on the recent regulation revisions, regarding industrial noise, proposed by the Workers’ Compensation Board of British Columbia.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/403
Canadian Acoustics; Vol. 5 No. 2 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/404
2012-12-26T19:41:42Z
jcaa:ART
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"770401 1977 eng "
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Status of Research in Acoustic Imaging and Holography
Jones, H. W.
Acoustics Group, The University of Calgary Calgary, Alberta, Canada, T2N 1N4
his paper reviews the results of research in imaging reported in the last two years approximately. The emphasis is placed on the high frequency applications of this subject and very little reference is made to sonar and none to geological applications. The subject is discussed under three main divisions, direct (pulse echo) imaging, holography and finally particular devices. Emphasis has been placed on the physical principles used. It is assumed the reader is conversant with the outlines of earlier work in the field.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/404
Canadian Acoustics; Vol. 5 No. 2 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/408
2012-12-26T19:41:44Z
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"771001 1977 eng "
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A Rapid Barrier Height Calculation Method
Hemingway, J. R.
SNC/GECO Canada Inc., Toronto, Ontario
One of the difficulties in designing a barrier to attenuate sound levels outdoors is that although it is easy to calculate the attenuation a certain barrier height will give, it is not so easy to reverse the process to determine what barrier height is necessary to provide a certain attenuation. In this paper we present a method that provides a simple, rapid and convenient procedure for calculating the barrier height to provide a required sound attenuation with acceptable accuracy.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/408
Canadian Acoustics; Vol. 5 No. 4 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/409
2012-12-26T19:41:44Z
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"771001 1977 eng "
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Experiences With a New Single Number Sound Insulation Rating Method
Whicker, D. J.
Barron and Associates Consulting Acoustical Engineers, 3284 Heather Street, Vancouver, B.C.
Hall, G. D.
Barron and Associates Consulting Acoustical Engineers, 3284 Heather Street, Vancouver, B.C.
Rivard, M. T.
Barron and Associates Consulting Acoustical Engineers, 3284 Heather Street, Vancouver, B.C.
At the present time, the specification of party wall systems to provide air-borne sound isolation in multiparty dwellings is based on laboratory tests of the Sound Transmission Class of partitions. Designers and regulatory authorities use this rating in an attempt to provide a desired, or minimum, acoustic isolation. However, as sound is transmitted from room to room by several paths, installation of an adequately rated party wall is no guarantee of acceptable performance of the finished building. The American Society for Testing and Materials (ASTM) has published a recommended practice (E 597-77T) which provides a method for "Determining a Single Number Rating of Air-borne Sound Isolation in Multi-Unit Building Specifications". This method states that "other sound paths are often of equal importance and must be included in any measurement of acoustic isolation" and "this isolation is readily measured in terms of the simple noise reduction between a pair of rooms". If for some non-evident reason the noise isolation of a room pair falls short of the anticipated value, then the path at fault may be identified by procedures of Recommended Practice E336, "Measurement of Air-borne Sound Insulation", or other valid method. In this paper, we discuss the development of a noise source meeting the requirements of ASTM E597-77T and discuss our experiences in its calibration and field use.
Canadian Acoustical Association / Association canadienne d'acoustique
1977-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/409
Canadian Acoustics; Vol. 5 No. 4 (1977)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/410
2012-12-26T19:41:45Z
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"780101 1978 eng "
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A Comparison of the Annoyance Reduction Effect of Different Shielding Types
Birnie, Susan
McMaster University, Hamilton, Ontario
In view of the many expensive measures currently being taken to protect people from noise, the question which arises is whether the methods being used are as effective in reducing the impact of noise on people as they are in reducing the physical sound levels. This question is important since the methods used to date have assumed that physical measures of sound are reliable indicators of the effects of noise on people. The work done for this paper has provided an empirical test of that assumption, in the situation where some kind of barrier or shielding is installed between the highway and the residential area. This aspect is important to consider because transportation agencies are turning increasingly to the construction of barriers and buffers, as a method of reducing transportation noise.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/410
Canadian Acoustics; Vol. 6 No. 1 (1978)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/411
2012-12-26T19:41:46Z
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"780101 1978 eng "
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An Overview of Noise Related Health Effects
Benwell, D. A.
X-rays and Radiation Devices Division, Radiation Protection Bureau, Brookfield Road, Health & Welfare Canada, Ottawa, Ontario. K1A ICI
This paper attempts to summarize those aspects of noise related to health. In a field in which technology is advancing rapidly and where research into noise-induced bioeffects is unable to keep pace with these advances, no attempt has been made to provide details. Instead, an outline of current knowledge in each of the areas concerned and the direction of further research required will be presented. It is planned to publish a document on this background information and to follow it with specific criteria on each of the various health effects of noise.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/411
Canadian Acoustics; Vol. 6 No. 1 (1978)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/412
2012-12-26T19:41:46Z
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"780401 1978 eng "
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The Energy Costs of Some Noise Abatement Procedures
Leong, R. K.
Civil Aeronautics Transport Canada, Place de Ville, Ottawa, Ontario K1A 0N8
The growth of commercial jet transport since 1957 has been accompanied by a growing concern with the increased noise levels in communities adjacent to airports. To alleviate this impact, noise abatement procedures for aircraft operations were implemented. Amongst these procedures are : the use of preferential runway systems to avoid overflying densely populated areas, power reduction after takeoff, reduced thrust takeoff, steeper glide slopes during approach and delayed flap landing. However, the recent "energy crisis" and subsequent sharp rise in aviation fuel prices have created a need to determine how much these noise abatement procedures are costing us. In an attempt to obtain some energy costs of these procedures, a theoretical study was conducted. For this paper, fuel consumption and noise reduction benefits of some noise abatement departures are presented.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/412
Canadian Acoustics; Vol. 6 No. 2 (1978)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/413
2012-12-26T19:41:47Z
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"780401 1978 eng "
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dc
Impulsive Noise Measurements with a Conventional Sound Level Meter
Behar, A.
Acoustics Office, Systems Research and Development Branch Ministry of Transportation and Communications, Ontario
Riganti, J. M.
Divisiôn Acûstica Instituto National de Tecnologia Industrial Buenos Aires, Argentina
A continuous noise can be defined by its sound pressure level and its frequency content. If the energy of the noise is also of interest, then the duration must also be taken into account. The situation is not the same when an impulsive noise has to be evaluated because, besides the characteristics listed above, the peak value and shape of the waveform, as well as its duration, are of interest. The object of the present study was to find out if it is possible to find the impulse signal's time constant and its peak level by using an inexpensive SLM, such as one built to IEC 123 specification accuracy, and measuring the "fast" and "slow" response readings.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/413
Canadian Acoustics; Vol. 6 No. 2 (1978)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/414
2012-12-26T19:41:47Z
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"780401 1978 eng "
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Properties of Railway Wheels
Strasberg, L.
Systems Research and Development Branch, Research and Development Division, Ontario Ministry of Transportation and Communications
Perfect, N.
Systems Research and Development Branch, Research and Development Division, Ontario Ministry of Transportation and Communications
Elliott, G. L.
Systems Research and Development Branch, Research and Development Division, Ontario Ministry of Transportation and Communications
The urban railway is ideally suited for high density corridors or for those areas where urban growth is considered desirable. However, urban railways are limited in their application by high capital requirements and by train noise which can disturb tne community served by the system. Previous investigations into the nature of railway noise have shown that wheel/rail noise is dominant, at least insofar as electric trains are concerned. It has been shown that sound radiated by the wheel is a significant part of the total noise. Many different types of railway wheels have been tested on transit systems with varying degrees of success. However, little has been published which would enable an operator to compare the different wheels on the basis of their fundamental mechanical properties. The purpose of this paper is to present some laboratory data on four common railway wheels.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/414
Canadian Acoustics; Vol. 6 No. 2 (1978)
eng
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oai:jcaa.caa-aca.ca:article/418
2012-12-26T19:41:49Z
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The Relationship Between Energy Considerations and Noise Control in New Residential Developments
Hemingway, J. R.
SNC/GECO Canada Inc., 74 Victoria Street Toronto, Ontario M5C 2A5
The Province of Ontario has taken a leading position with regard to the control of both indoor and outdoor noise levels on new residential developments. Some of the noise control methods in use offer definite possibilities for both energy conservation and solar energy collection. Other methods have opposite effects and increase energy consumption. This interdisciplinary paper examines both areas, pointing out where energy conservation can be very easily accomplished simultaneously with noise control, and also examining methods of handling both concerns even when they have opposing influences.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/418
Canadian Acoustics; Vol. 6 No. 4 (1978)
eng
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oai:jcaa.caa-aca.ca:article/419
2012-12-26T19:41:50Z
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The Ford Auditorium
Dickinson, Philip
The Henry and Edsel Ford Auditorium is the home of the Detroit Symphony Orchestra, which has been a dominant influence in Detroit's cultural development for more than 50 years. The auditorium, situated in Detroit's riverfront Civic Center, is owned and operated by the City of Detroit. It is used not only for individual or group artistic performances but for lectures, television and radio broadcasts, motion picture screenings, a variety of assemblies, and for displaying the very latest of the Ford automotive products.
Canadian Acoustical Association / Association canadienne d'acoustique
1978-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/419
Canadian Acoustics; Vol. 6 No. 4 (1978)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/420
2012-12-26T19:41:51Z
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"790101 1979 eng "
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The Physiological Effects of Noise Exposure on Man
Jacobson, John T.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
No one would argue the point that modem technology has -introduced rapid growth and advancement throughout the world within the last few decades. While achievements are countless, one detrimental adversity which has been, until recently, an unknown consequences is the effect of noise on man. Specifically, noise has introduced irreversible hair cell damage to the cochlea reducing man’s potential for normal hearing sensitivity. Noise induced hearing loss (NIHL) may be caused by either long term exposure above the damage risk criteria, or instantaneous exposure. In any event, hair cell damage to the cochlea is the end result. Depending on man's exposure to noise, either temporary threshold shifts (TTS) or permanent threshold shifts (PTS) will ensue. The intent of this paper is to present current research in the area of noise exposure as it affects physiological changes within the auditory system. In addition, concomitant changes that face man due to a reduction in hearing sensitivity are discussed. Finally, current research by the present author in the area of noise exposure, ototoxicity and the additive effects on high risk infants are presented.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/420
Canadian Acoustics; Vol. 7 No. 1 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/421
2012-12-26T19:41:52Z
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"790101 1979 eng "
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Intensities Difference in Dichotic Listening Tasks
Jacobson, John T.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
Manzer, Heather D.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
Seitz, Michael R.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
A wealth of previous studies have continuously demonstrated that when consonant-vowel (CV) nonsense syllables are simultaneously presented to normal hearing subjects in a dichotic listening task, a significant hemispheric asymmetry will be reflected from reported scores. That is when speech is used as a dichotic stimuli, a right ear advantage (REA) results. While functional hemispheric asymmetry has received supporting evidence from electrophysiological animal study as well as anatomical and physiological evidence in man, the actual size of the right ear advantage has varied from study to study. One parameter of dichotic listening tasks which have produced inconsistent differences between right and left ear scores as well as overall performance, may be attributed to changes in the intensity presentation level. Depending on the intensity level used, a wide variance in ear score differences have been observed. To date, presentation intensities have been based on absolute sound pressure levels (SPL). As an alternative to this procedure, the use of the most comfortable loudness levels (MCL) have been suggested. Recently, data have provided results which indicated that MCL is clinically feasible, statistically reliable and provides the intensity presentation level that would produce maximum speech discrimination. To date, incorporation of MCL as a presentation level in dichotic listening studies has not been explored. Due to the variance in ear scores derived under different levels of stimulus presentation, it was the purpose of this study to determine if the use of MCL as a presentation intensity could be demonstrated to be a viable alternative to absolute intensity levels in dichotic listening tasks.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/421
Canadian Acoustics; Vol. 7 No. 1 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/422
2012-12-26T19:41:52Z
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"790101 1979 eng "
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Tone Pip Elicited BER's
Wood, Marianne H.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
Seitz, Michael R.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
Jacobson, John T.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
Since the initial work of Jewett and Williston in 1971, a remarkable degree of quantification and confirmation of brainstem evoked response data has been published. The consensus of findings has led to the clinical acceptance of BER as an intricate test in the diagnostic assessment of both normal and pathological subjects. BER studies continue to demonstrate that the BER technique does provide an objective means for assessing hearing, especially among infants and difficult-to-test patients. The principle underlying BER is the same as that used for any evoked potential study. Basically, EEG changes resulting from auditory stimuli are recorded by scalp electrodes. The result is a specific wave form which may be recorded and the latency of each wave peak can be accurately measured. All in all, there are seven different wave peaks that are available to use as measurement points, some more stable than others, each reflecting different areas of neural activity in the auditory pathways through the brainstem. The individual peaks reflect changes in the auditory pathway that occur within the first 10 msec after the onset of the auditory stimulus. Each of the seven different waves has its own Roman numeral designator and anatomical location. In brainstem evoked response audiometry, Wave V has been found to be the most diagnostically useful waveform. Accurate estimates of thresholds have been made from the curves described by the latency values of the Wave V's of BER's elicited by click stimuli. These thresholds refer to intensity only and lack the frequency specificity required for audiological assessment. Speculation exists that other stimuli, especially more frequency-specific stimuli, might provide additional frequency-specific information. The purposes of our study were 1) to obtain Wave V latency curves for selected tone pip frequencies; 2) to compare the frequency-specific curves with previously obtained tone pip curves from other studies; and 3) to determine, if possible, the clinical utility of the selected procedure.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/422
Canadian Acoustics; Vol. 7 No. 1 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/423
2012-12-26T19:41:53Z
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"790101 1979 eng "
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Helicopter Noise Propagation Studies for Air Installation Compatible Land Use Zoning
Dickinson, Philip
Bickerdike, Allen, Partners
Canadian Acoustical Association / Association canadienne d'acoustique
1979-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/423
Canadian Acoustics; Vol. 7 No. 1 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/424
2012-12-26T19:41:54Z
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"790401 1979 eng "
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Community Response to Aircraft Noise in Relation to Background Levels
Taylor, Martin S.
Department of Geography, McMaster University, Hamilton, Ontario
Hall, Fred L.
Department of Geography, McMaster University, Hamilton, Ontario
Birnie, Susan E.
Department of Geography, McMaster University, Hamilton, Ontario
This paper examines the effect of variations in background noise levels on community reactions to aircraft noise using questionnaire and sound level data collected at a stratified random sample of residential sites in the vicinity of Toronto International Airport. The effects of variations in background noise (24 hour Leq) on individual and aggregate responses to aircraft noise are'examined. The response variables considered include annoyance, activity interference and complaints. The results of various statistical analyses show that the effect of background level is generally not significant. The direction of the weak effects on individual responses varies by level of aircraft noise exposure and type of response. These findings are compared with those from previous studies.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/424
Canadian Acoustics; Vol. 7 No. 2 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/425
2012-12-26T19:41:56Z
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"790401 1979 eng "
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Measurements and Prediction of Sound Levels in Quiet Urban Areas -- Urban Hum
Kelsall, Tim
Hatch Associates Ltd.,21 St. Clair Avenue East, Toronto, Ontario M4T 1L9
Canadian Acoustical Association / Association canadienne d'acoustique
1979-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/425
Canadian Acoustics; Vol. 7 No. 2 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/428
2012-12-26T19:41:57Z
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"790701 1979 eng "
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Vibration Behaviour of the MTC Experimental Subway Wheel
Strasberg, L.
Research and Development Division, Ontario Ministry of Transportation and Communications
Tiessinga, J.
Research and Development Division, Ontario Ministry of Transportation and Communications
Kono, K.
Research and Development Division, Ontario Ministry of Transportation and Communications
The natural frequencies, mode shapes, and mechanical impedances of a resilient type subway wheel are presented. An impact method which uses Fourier techniques to analyse the vibrations of the wheel is described. Several natural frequencies and mode shapes not previously reported are presented.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/428
Canadian Acoustics; Vol. 7 No. 3 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/429
2012-12-26T19:41:57Z
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"790701 1979 eng "
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An Environmental Stimulus for Sudden Death in Infancy?
Dickinson, Philip
Bickerdike, Allen, Partners, Toronto, Salt Lake City, London
This paper contains a review of the environmental conditions that may be associated with Sudden Infant Death Syndrome (SIDS), and notes a probable association in Utah between SIDS and atmospheric temperature inversions accompanied by a gentle breeze. These conditions also enhance the strength of low frequency sound in rooms; moreover it is only in certain-size rooms and moving automobiles (another low frequency sound environment) that SIDS has been observed. The author argues that such sound could be one of the links in SIDS, perhaps through direct transmission into the skull via an infant's not- yet-closed fontanelle.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/429
Canadian Acoustics; Vol. 7 No. 3 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/430
2012-12-26T19:41:58Z
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"790701 1979 eng "
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Method and Interpretation of Surveys on Noise Annoyance
Krammer, Frank
Noise Pollution Control Section, Environment Ontario
Major practical considerations during the design and analysis of sociological noise surveys are briefly discussed, particularly as they relate to choice and interpretation of statistical tests. The discussion concentrates on the appropriate use of data and scale transformations which may not only assist in the interpretation of results but also clarify seeming discrepancies both within a study as well as between apparently conflicting results reported in the literature. Applicable scale transformations are supported by the specification and discussion of theoretically based quantitative functions which may be used to predict human response from noise-level measures of loudness.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/430
Canadian Acoustics; Vol. 7 No. 3 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/431
2012-12-26T19:41:59Z
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"790701 1979 eng "
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Theoretical Models for Relating Annoyance to Noise Level
Krammer, Frank
Noise Pollution Control Section, Environment Ontario
Theoretical mathematical models are formulated to specify the relationship between human annoyance and levels of noise» based only on well confirmed assumptions. The proposed theories are consistent with descriptive models and appear capable of explaining the underlying mechanism as well as previously apparent discrepant findings.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/431
Canadian Acoustics; Vol. 7 No. 3 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/432
2012-12-26T19:41:59Z
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"791001 1979 eng "
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A Methodology for Determining Errors in Aircraft Noise Exposure Models
Leong, Robert K.
Aeronautical Environment Technology Section, Civil Aeronautics, Transport Canada, Ottawa
This paper describes a technique for estimating the error in predicting noise exposure indexes due to inaccuracy in the input data required in their calculation.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/432
Canadian Acoustics; Vol. 7 No. 4 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/433
2012-12-26T19:42:00Z
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"791001 1979 eng "
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Calculation of Energy Equivalent Noise Level from Truncated Noise Level Distributions
Rackl, Robert
Wyle Research, 128 Maryland Street, El Segundo, California 90245
Formulas for calculating the ensemble energy equivalent noise level for a population of sources are given for truncated uniform, normal, and Gamma distributions.
Canadian Acoustical Association / Association canadienne d'acoustique
1979-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/433
Canadian Acoustics; Vol. 7 No. 4 (1979)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/435
2012-12-26T19:42:01Z
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"800101 1980 eng "
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Noise Control in the Automotive Industry: Some Practical Experience
Barman, Mohan
Vibron Limited Mississauga, Ontario
The General Motors Transmission Plant in Windsor, Ontario is presently undergoing a large-scale expansion program. This program has included a commitment by management to meet all appropriate sound and vibration criteria related to in-plant, office and environmental acoustics. The consequence of this decision is that substantial expenditures will be allocated for noise and vibration control. The following paper presents some aspects of a noise and vibration control program generated to ensure adequate control of cost and performance of the acoustical materials and hardware being considered. Also discussed are methods developed to deal with the practical problems of meeting acoustical design targets in a major industrial plant and results obtained to date.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/435
Canadian Acoustics; Vol. 8 No. 1 (1980)
eng
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oai:jcaa.caa-aca.ca:article/436
2012-12-26T19:42:02Z
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"800101 1980 eng "
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Ontario's Highway Noise Barrier Research
May, Daryl N.
Wyle Laboratories, 128 Maryland Street, El Segundo, California 90245
Ontario's Ministry of Transportation and Communications (MTC) has been involved in a highway noise R&D and implementation program to quieten the provincial freeway system in residential neighborhoods. The program primarily involves noise barriers and pavement, because these two items are within provincial control. (The federal government regulates new vehicle noise.) The barrier construction program now has a $7.5m budget, making it probably the largest Canadian noise control program.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/436
Canadian Acoustics; Vol. 8 No. 1 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/437
2012-12-26T19:42:03Z
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"800101 1980 eng "
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Nonpathological Considerations in the Determination of Brainstem Electric Response Activity
Jacobson, John T.
School of Human Communications Disorders, Dalhousie University, Halifax, Nova Scotia
Morehouse, Robin
Nova Scotia Hearing & Speech Clinic, Halifax, Nova Scotia
Seitz, Michael R.
Department of Biocommunications, University of Alabama at Birmingham, Birmingham, Alabama
The introduction of brainstem auditory evoked potentials has provided a relatively new technique for monitoring neural activity from the auditory nerve and brainstem nuclei. It is the purpose of this paper to present the effects of stimulus presentation rate and sex on brainstem response activity. Ten normal hearing adult subjects (five male and five female) received click stimuli presented at intensity levels of 70, 50, 30, and 20 normal hearing level (nHL) at presentation rates of 10.5, 33.5, and 80.5 per second. Significant Wave V latency differences were found between male and female subjects as well as between presentation rates. Results suggest the establishment of male, female normative latency data at known presentation rates prior to the accurate assessment of auditory sensitivity or neurological brainstem disorders.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/437
Canadian Acoustics; Vol. 8 No. 1 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/438
2012-12-26T19:42:04Z
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"800401 1980 eng "
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A Review of Ultrasound Applications
Benwell, D. A.
Non-Ionizing Radiation Section, Radiation Protection Bureau, Health and Welfare Canada, Ottawa, Ontario
A brief history of early applications of ultrasound is given together with an overview of the diverse applications of ultrasound today. Ultrasound is defined and its properties are compared with those of sound.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/438
Canadian Acoustics; Vol. 8 No. 2 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/439
2012-12-26T19:42:05Z
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"800401 1980 eng "
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Sound Levels and Noise Exposure in Two Ontario Generating Stations
Taylor, A. G.
Ontario Hydro 700 University Avenue Toronto, Ontario M5G 1X6
To, J. C.
Ontario Hydro 700 University Avenue Toronto, Ontario M5G 1X6
A study of sound levels throughout two fossil fired generating stations, and the noise exposure to staff, was carried out to evaluate the noise hazard and to establish the relative importance of various equipment in the noise doses incurred.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/439
Canadian Acoustics; Vol. 8 No. 2 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/440
2012-12-26T19:42:05Z
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"800401 1980 eng "
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Effect of Stoplights on Traffic Noise
Halliwell, R. E.
National Research Council of Canada, Division of Building Research, Ottawa, Ontario KlA 0R6
A study was undertaken to determine how the noise level due to free-flowing traffic is affected by the insertion of a traffic light. Field measurements were taken at eight different traffic light locations representing two configurations; that of two intersecting straight roads, and a tee junction. A reference level measured at a point where traffic noise was unaffected by the intersection was used in conjunction with the NRC Traffic Noise Prediction Model to assess the change in noise level in the region about the traffic light.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/440
Canadian Acoustics; Vol. 8 No. 2 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/441
2012-12-26T19:42:06Z
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"800701 1980 eng "
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The Elusive Connection
Shaw, E. A.G.
Physics Div., National Research Council (Ottawa/Canada)
In his monograph Electroacoustics, F.V. HUNT (1954) described the carbon microphone as "the only 'bad connection' tolerated in the telephone system". This whimsical comment was, of course, inspired by the unique electrical properties of that remarkable transducer. A broader view, encompassing the acoustical as well as the electrical elements of the system, would surely compel us to recognize the earphone, another essential element of the telephone system, as a connection of equally questionable quality. It was indeed this doubtful connection, lying at the heart of audiometric measurements, which first prompted my colleagues and I in Ottawa to enquire about the acoustics of the external ear many years ago. It seemed then, as now, that despite the remarkable advances in electromechanical transduction since the days of Alexander Graham Bell, the coupling between earphones and ears still rested on a very flimsy acoustical foundation. We soon found that there were questions concerning the external ear which were larger than the technological artifacts that had started us on our journey and it is to these larger questions that my title refers. The "elusive connection", then, is associated with the external ear but really embraces the entire transmission path between the sound source, which may be near the ear or in the far field, and the oval window of the cochlea which is the input terminal of the inner ear. The questions which arise fall under at least five headings: (i) Anatomy and function: How does the external ear work? What are the functions of its various components? How is it coupled to the middle ear? What parameters best define its performance? (ii) Reception efficiency: How well does the external ear collect sound energy? How well is that energy transmitted to the inner ear? (iii) Sound localization: To what extent are we able to localize sound sources away from the horizontal plane especially sources lying in the symmetry plane of the head? What localization tasks can we perform with a single ear? What are the relevant auditory cues? (iv) Space perception: Under what circumstances and how well do we externalize sound when listening under artificial conditions such as those arising with earphones? (v) Measurement techniques: How should we specify and measure acoustic stimuli? As we shall see, some of these questions were raised more than one hundred years ago but still lack precise answers.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/441
Canadian Acoustics; Vol. 8 No. 3 (1980)
eng
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oai:jcaa.caa-aca.ca:article/442
2012-12-26T19:42:08Z
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"800701 1980 eng "
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A Comparison of Two Staionary Measurement Procedures for Truck Exterior Levels
Kennedy, D. S.
Harford, Kennedy, Wakefield, Ltd.
Welbourne, E. R.
Transport Canada
SAE RP J1096 and CSA Standard Z107.22 are compared in terms of their performance as predictors of pass-by sound levels measured in accordance with SAE RP J366b. The comparinon is based on the results of tests on 60 diesel trucks covering a range of ages, sound levels and configurations. The CSA procedure is found to be at least as good a predictor of pass-by sound levels as RP J1096 and can be used on smaller and noisier sites. The results of some exploratory measurements of the effects of wind and temperature gradients on the repeatability of the two procedures are also presented and discussed.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/442
Canadian Acoustics; Vol. 8 No. 3 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/444
2012-12-26T19:42:10Z
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"801001 1980 eng "
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Propagation du son sur les Surfaces Enneigees
Nicolas, J.
Université de Sherbrooke, Sherbrooke, Qué.
Piercy, J. E.
Conseil national de recherches, Ottawa, Ont.
Truong, D. M.
Université de Sherbrooke, Sherbrooke, Qué.
Prédire comment le son se propage d'un émetteur à un récepteur n'est pas chose facile. A l'extérieur, été comme hiver, on doit effectuer des essais selon des normes qui ne tiennent presque jamais compte de la surface réfléchissante entre la source et le micro de mesure. Des données sont disponibles sur l'effet de surfaces telles que la pelouse ou l'asphalte, mais très peu ou pas en ce qui a trait aux surfaces enneigées. Cette étude aborde les aspects modélisation mathématiques et mesures expérimentales de l'effet de la neige sur la propagation sonore. Il en ressort que, sous certaines conditions, on peut prédire avec assez d'exactitude l'effet de la neige sur la transmission sonore.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/444
Canadian Acoustics; Vol. 8 No. 4 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/445
2012-12-26T19:42:10Z
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driver
nmb a2200000Iu 4500
"801001 1980 eng "
2291-1391
0711-6659
dc
Vibration Reduction Of Vertical Pumps - A Case History
Osman, M. M.
Ontario Hydro, Power Equipment and Energy Studies Dept, 700 University Avenue, H14 Toronto, Ontario M5G 1X6
Vertical pumps are susceptible to vibration problems partly due to their "one-point" attachment to the foundation. A case history of high vibrations of a vertical pump and a design modification to remedy it are presented here. Vibration measurements were carried out to identify the causes for the high, unacceptable vibration levels and to assess the effectiveness of the proposed design modification.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/445
Canadian Acoustics; Vol. 8 No. 4 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/446
2012-12-26T19:42:11Z
jcaa:ART
driver
nmb a2200000Iu 4500
"801001 1980 eng "
2291-1391
0711-6659
dc
Noise Exposure of Truck Drivers
Reif, Z. F.
Dept, of Mechanical Engrg., Univ. of Windsor (Windsor/Ontario)
Moore, T. N.
Dept, of Mechanical Engrg., Univ. of Windsor (Windsor/Ontario)
Steevensz, A. E.
Pratt and Whitney of Canada, Ltd., (Longueuil/Quebec)
The noise exposure of truck drivers was measured during normal commercial payload runs with special instruments, which are equipped with subminiature microphones. These can be mounted within the cavum of the concha, where measurements are least affected by extraneous effects. By means of these instruments sound levels were continuously recorded within both ears of the driver and at the centre of the cab. Analysis of results shows that the driver's exposure is highest during freeway hauls and that permanent hearing loss hazard may exist. Frequent use of radio or CB radio can significantly increase this hazard. It is also evident that the sound levels measured within the ears of the driver are generally significantly higher than at the centre of the cab.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/446
Canadian Acoustics; Vol. 8 No. 4 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/447
2012-12-26T19:42:11Z
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driver
nmb a2200000Iu 4500
"801001 1980 eng "
2291-1391
0711-6659
dc
Limitations in the Measurement of the Sound Absorption Coefficient on Materials for Highway Noise Barriers
Behar, A.
Central Safety Services, Ontario Hydro, 757 McKay Road, Pickering, Ontario L1W 3C8
Some absorbing materials used to improve the performance of highway noise barriers are rigid and their flow resistance is high. They absorb sound energy in a complex porous and resonant way and their absorption coefficient is strongly dependent upon their mounting. In our study, three rigid materials measured with the standing wave tube exhibited resonant peaks at frequencies depending on their thickness. One of the materials, measured in a reverberant chamber lying on the floor, showed the same resonant peak. However, when measured in the same chamber in a free standing position, the absorption curve was typical of a porous material. The results of the study confirm that "hard," rigid, acoustical materials should not be measured with the standing wave tube but rather in a free standing position in a reverberant room.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/447
Canadian Acoustics; Vol. 8 No. 4 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/448
2012-12-26T19:42:12Z
jcaa:ART
driver
nmb a2200000Iu 4500
"801001 1980 eng "
2291-1391
0711-6659
dc
Noise Testing of Vehicles - Acoustic Propagation Phenomena
Piercy, J. E.
Physics Div., National Research Council (Ottawa/Canada)
Embleton, T. F.W.
Physics Div., National Research Council (Ottawa/Canada)
A number of propagation phenomena which cause variability in the noise testing of vehicles using standard procedures have been isolated and studied. Included are the effects of interference produced by reflection from various ground surfaces, the effects of refraction caused by wind and temperature gradients in the atmosphere, changes in sound level due to the wake of the vehicle, and the effects of normal atmospheric turbulence.
Canadian Acoustical Association / Association canadienne d'acoustique
1980-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/448
Canadian Acoustics; Vol. 8 No. 4 (1980)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/450
2012-12-26T19:42:14Z
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driver
nmb a2200000Iu 4500
"810101 1981 eng "
2291-1391
0711-6659
dc
La dose de bruit. Comment la mesurer dans la grande entreprise
Coté, J.
Société d'électrolyse et de chimie Alcan Ltée, Service du développement technologique et Contrôle de l'environnement, C.P. 500, Arvida, Québec, G7S 2C5
Morin, M.
Société d'électrolyse et de chimie Alcan Ltée, Service du développement technologique et Contrôle de l'environnement, C.P. 500, Arvida, Québec, G7S 2C5
A hearing loss caused by prolonged exposure to noise is well known. It must also be recognized that the noise dosage should be used as a means to predict such hearing loss. However, methods for measuring the noise dosage are numerous. A brief review of a few methods and their evaluation are given. In a large plant and especially in the presence of variable noise levels and exposures the audio-dosimetry-sound level meter method would appear a valuable choice for measuring the noise dosage and identify the noise source (s) responsible for over-exposure.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/450
Canadian Acoustics; Vol. 9 No. 1 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/451
2012-12-26T19:42:16Z
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"810101 1981 eng "
2291-1391
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The Effectiveness of Hearing Protectors in Practice
Alberti, P. W.
Riko, K.
Abel, S. M.
Kristensen, R.
A series of workmen being evaluated for pensions for occupational hearing loss were asked to bring their own hearing protectors from work, to fit them themselves, following which attenuation studies were made. The muffs and most earplugs produced similar attenuation levels at high frequencies, although the muffs produced less attenuation at low frequencies. In all cases the mean attenuation was significantly lower than optimum figures suggested in the literature, and the standard deviation was relatively high. Personally molded earplugs were significantly less effective than tire other plugs used.Reasons are discussed for the relatively poor performance of these devices and the concept of assumed protection, i.e. mean minus one standard deviation, is discussed. There is need for better instruction on how to use hearing protectors if they are to be effective.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/451
Canadian Acoustics; Vol. 9 No. 1 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/452
2012-12-26T19:42:17Z
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driver
nmb a2200000Iu 4500
"810101 1981 eng "
2291-1391
0711-6659
dc
Model Study of Double Traffid Noise Barriers
King, Frances S.M.
Faculty of Engineering Science, The University of Western Ontario, London, Ontario N6A 5B9
This paper investigates double barriers using a scale modelling technique.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/452
Canadian Acoustics; Vol. 9 No. 1 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/453
2012-12-26T19:42:17Z
jcaa:ART
driver
nmb a2200000Iu 4500
"810101 1981 eng "
2291-1391
0711-6659
dc
An Improved Transducer Mount for Ground Vibration Measurements
Barman, Mohan
BARMAN COULTER SWALLOW ASSOCIATES, REXDALE, ONTARIO
Coulter, John E.
BARMAN COULTER SWALLOW ASSOCIATES, REXDALE, ONTARIO
Standardization of soil vibration measurement has been an area of very limited consideration up until the last decade or so. To date measurement methodology has only been partially documented. The current demand for land in built up areas has led to building construction near, and on top of rail transportation corridors, and caused sufficient difficulties to demonstrate a requirement for reliable vibration measurement methods. This paper discusses transducer mounting methods for obtaining accurate soil vibration measurement. Proposed, is an inexpensive system believed to offer considerable advantage over current practices.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/453
Canadian Acoustics; Vol. 9 No. 1 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/458
2012-12-26T19:42:20Z
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"810401 1981 eng "
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Report of Environmental Noise in Ontario with Reference to Health Related Effects
Manuel, J.
The Noise Pollution Control Section, Ontario Ministry of the Environment, has received a new report on environmental noise in Ontario with reference to health related effects.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/458
Canadian Acoustics; Vol. 9 No. 2 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/459
2012-12-26T19:42:21Z
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"810401 1981 eng "
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The Acoustics Section; A Profile of the Laboratory
Shaw, Edgar A.G.
Division of Physics, National Research Council, Ottawa, Ontario. K1A 0S1.
When Editor Deirdre Benwell invited me to open this series, my first inclination was to offer a simple account of our tasks and responsibilities. On reflection, however, it became apparent that a narrative which failed to bring out the philosophy and style of a scientific institution would miss the mark. That is why I have gone back to our roots and provided some context to frame the diverse activities in which we have engaged over the years.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/459
Canadian Acoustics; Vol. 9 No. 2 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/460
2012-12-26T19:42:21Z
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"810401 1981 eng "
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Towards an Epidemiological Procedure for the Classification of Results from Screening Audiometry among Noise Exposed Workers
Hetu, R.
Ecole d'orthophonie et d'audiologie, Université de Montréal, C.P. 6128, Montréal, Québec
Boudreault, V.
Ecole d'orthophonie et d'audiologie, Université de Montréal, C.P. 6128, Montréal, Québec
Cote, B.
Ecole d'orthophonie et d'audiologie, Université de Montréal, C.P. 6128, Montréal, Québec
Current methods for the classification of hearing impairment of noise-exposed workers using screening audiometry do not allow a clear definition of the severity of the noise problem in a plant. An epidemiological procedure is proposed relying on a statistical index of the age effect on hearing sensitivity. An example of application of the procedure is presented for a population of foundry workers. It is shown that a worker has approximately 4 chances in 10 of suffering from a significant hearing loss when employed in this plant for 15 years. The reliability of the procedure is discussed in terms of the size of the target population and the influence of extra-occupational sources of hearing loss.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/460
Canadian Acoustics; Vol. 9 No. 2 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/461
2012-12-26T19:42:22Z
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"810401 1981 eng "
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Proposed Regulation for Noise in Ontario. CAA Toronto Chapter Meeting
Abel, Sharon M.
Report of the III Technical Meeting of the CAA Toronto Chapter, January 19, 1981
Canadian Acoustical Association / Association canadienne d'acoustique
1981-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/461
Canadian Acoustics; Vol. 9 No. 2 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/462
2012-12-26T19:42:22Z
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"810401 1981 eng "
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An Analytical Model for Input Spectral Densities for Response Estimation
Sankar, T. S.
Department of Mechanical Engineering, Concordia University, Montreal, Canada
Jha, V. K.
Department of Mechanical Engineering, Concordia University, Montreal, Canada
Bhat, R. B.
Department of Mechanical Engineering, Concordia University, Montreal, Canada
A mathematical approach is proposed to describe any arbitrarily varying power spectral density of a random process in order to obtain analytically the response of mechanical systems to such inputs. The proposed model optimally envelopes the input power spectral density with linear segments having rising and falling slopes as well as flat portions in dB scale and can be used to describe any power spectral density distribution to the required degree of accuracy. Response of a mechanical system to an arbitrary random loading is obtained by describing the input using this model and the result is compared against experimental ly measured response for the system under same loading. The computed mean square response agreed well with the experimentally measured value, thereby validating the usefulness of the proposed model in evaluating the response of any general dynamic systems under random loading.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/462
Canadian Acoustics; Vol. 9 No. 2 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/463
2012-12-26T19:42:23Z
jcaa:ART
driver
nmb a2200000Iu 4500
"810401 1981 eng "
2291-1391
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dc
Pourquoi effectuer des examens audiométriques en usines bruyantes
Hétu, R.
Ecole d'orthophonie et d'audiologie, Université de Montréal, C.P. 6128, Montréal, Québec, H3T 1A8
Evaluating the hearing status of populations of industrial workers in Québec raised the question of the effectiveness of ongoing hearing conservation programs at large and of monitoring audiometry in particular. The weaknesses of these testing programs are illustrated by means of a set data from a plant. This critical look is further supported by an analysis of the assumptions underlying hearing conservation in noise including the function of monitoring audiometry in this context. Guidelines for an optimal use of hearing tests in industry are presented.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/463
Canadian Acoustics; Vol. 9 No. 2 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/465
2012-12-26T19:42:25Z
jcaa:ART
driver
nmb a2200000Iu 4500
"810701 1981 eng "
2291-1391
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Acoustics in the Division of Building Research
Warnock, A.C. C.
National Research Council of Canada, Division of Building Research, Ottawa, Ontario KlA 0R6
The Noise and Vibration Section of the Division of Building Research (DBR) is concerned as the name suggests, with problems of acoustics and vibration as they relate to buildings. The work in the Section includes (1) studies of basic physical processes of propagation of sound and vibration in buildings; (2) studies of responses of people to sounds and vibration in their environment; and (3) the development of standard methods of measurement of the appropriate physical descriptors. The commitment, beyond research, is to apply the knowledge gained to the solution of specific building problems and to disseminate the information in appropriate form to designers, builders and the public.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/465
Canadian Acoustics; Vol. 9 No. 3 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/466
2012-12-26T19:42:26Z
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driver
nmb a2200000Iu 4500
"810701 1981 eng "
2291-1391
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dc
Importance et Facon de Preparer un Profil d'Exposition au Bruit Suite a une Demande de Reparation Pour Pretendue Surdite Professionnelle
Cote, J.
Société d'électrolyse et de chimie Alcan Ltée, Service du développement technologique et Contrôle de l'environnement, C.P. 500, Arvida, Québec, G7S 2C5
Talbot, G.
Société d'électrolyse et de chimie Alcan Ltée, Service du développement technologique et Contrôle de l'environnement, C.P. 500, Arvida, Québec, G7S 2C5
The authors emphasize the importance of knowing the total noise exposure dose in order to establish the cause and effect relationship in the case of a compensation request due to occupational hearing damage. A brief review of different studies and methods to estimate the total noise exposure dose and the risk of hearing loss is given. In most of these methods the noise exposure doses are based on quasi-stable noise. The authors present a method to establish a noise exposure profile which takes into account the employee's movements, the present and past doses of exposure and their variation with time to estimate the number of years at the different risk classes. A good correlation was established between the total exposure dose based on this method and the verdicts of hearing loss.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/466
Canadian Acoustics; Vol. 9 No. 3 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/467
2012-12-26T19:42:28Z
jcaa:ART
driver
nmb a2200000Iu 4500
"810701 1981 eng "
2291-1391
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Speech Intelligibility in Noise with Ear Protectors
Abel, S. M.
Alberti, P. W.
Riko, K.
Speech perception was tested in high level noise under controlled laboratory conditions in noise-exposed workmen and normal subjects, with and without a hearing protector. The group was further divided by age and English fluency, the latter group being included because of the high proportion of non-fluent English speakers in the Canadian workforce. In normal-hearing subjects the highest discrimination scores were found without background noise; they were lower with white noise as a masker, and even lower with crowd noise as a masker; wearing of a protector had no effect on intelligibility. The results for non-fluent English speakers were parallel with these results, but the scores were lower in all test conditions. In the presence of a high frequency hearing loss speech discrimination was lower than in the normals in quiet and in noise. The addition of a hearing protector dropped their discrimination score even further. In a flat hearing loss, wearing of a protector also worsened the speech discrimination score. The results are discussed.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-07-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/467
Canadian Acoustics; Vol. 9 No. 3 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/469
2012-12-26T19:42:30Z
jcaa:ART
driver
nmb a2200000Iu 4500
"811001 1981 eng "
2291-1391
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Workers' Compensation Board of British Columbia
Clark, E. B.
Engineering and Research Workers' Compensation Board of B.C, 5255 Heather Street, Vancouver, B.C. V5Z 3L8
This article provide an overall perspective of the Workers' Compensation Board of British Columbia. Three sections of the Workers Compensation Board of British Columbia are engaged in acoustical activities. These three are the Hearing Branch and two sections of Prevention Services, the Noise Control Section and the Engineering and Research Section.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/469
Canadian Acoustics; Vol. 9 No. 4 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/470
2012-12-26T19:42:30Z
jcaa:ART
driver
nmb a2200000Iu 4500
"811001 1981 eng "
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Noise Control in British Columbia
Tupper, V. J.
Workers' Compensation Board of B.C, 5255 Heather Street, Vancouver, B.C. V5Z 3L8
Three sections of the Workers Compensation Board of British Columbia are engaged in acoustical activities. These three are the Hearing Branch and two sections of Prevention Services, the Noise Control Section and the Engineering and Research Section. In this article Virginia Tupper, Manager of the Noise Control Section from its inception to 30 May 1981, covers the history and current activity of her section.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/470
Canadian Acoustics; Vol. 9 No. 4 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/471
2012-12-26T19:42:30Z
jcaa:ART
driver
nmb a2200000Iu 4500
"811001 1981 eng "
2291-1391
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dc
Simulation Ultrasonore de l'Impact Acoustique des Autoroutes
Migneron, J. G.
Centre de recherches en aménagement et développement, Laboratoire d’acoustique de 1'Ecole d’architecture Université Laval, Québec, G1K 7P4
This paper reports a research project undertaken since 1977 at the School of Architecture Acoustical Laboratory of Laval University. After a light review of the other research concerning ultrasonic simulation of highway noise, the progress of the different stages of the research are exposed as well as the technical means that have been used, particularly the ultrasonic generation system and the dynamic reproduction of the urban noise fluctuations. The resulting values are then compared to the real noise levels existing on the simulated urban site. The conclusion presents the possible applications for highways design and the control of efficiency for noise barriers used for the protection of residential areas.
Canadian Acoustical Association / Association canadienne d'acoustique
1981-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/471
Canadian Acoustics; Vol. 9 No. 4 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/472
2012-12-26T19:42:33Z
jcaa:ART
driver
nmb a2200000Iu 4500
"811001 1981 eng "
2291-1391
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LNG Carrier Underwater Noise Study for Baffin Bay
Leggat, L. J.
Defence Research Establishment Atlantic, Dartmouth, Nova Scotia
Merklinger, H. M.
Defence Research Establishment Atlantic, Dartmouth, Nova Scotia
Kennedy, J. L.
Defence Research Establishment Atlantic, Dartmouth, Nova Scotia
Large powerful liquid natural gas carriers may soon ply Arctic waters year round„ Concern has been expressed over the impact the resulting noise will have on Arctic marine life0 This study includes estimates of LNG carrier radiated noise source levels and resulting sound levels at a given distance from the ship for a number of operating conditions. Measurements of sound propagation and ambient noise conditions in Baffin Bay are used to estimate the ship noise levels in relation to the summertime noise background»
Canadian Acoustical Association / Association canadienne d'acoustique
1981-10-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/472
Canadian Acoustics; Vol. 9 No. 4 (1981)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/474
2012-12-26T19:42:35Z
jcaa:ART
driver
nmb a2200000Iu 4500
"820101 1982 eng "
2291-1391
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Sound levels around buildings near roadways
Quirt, J.D.
Div. of Building Res., Nat. Res. Council of Canada, Ottawa, Ont., Canada
Presents the results of preliminary measurements of the difference between the incident sound levels at the front and rear facades of suburban detached and semi-detached houses adjacent to major roadways. The measurement also yielded data on sound transmission through open windows and comparisons between the sound levels measured in open windows, at the surface of the building facade, and 2 m from the facade.
Canadian Acoustical Association / Association canadienne d'acoustique
1982-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/474
Canadian Acoustics; Vol. 10 No. 1 (1982)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/475
2012-12-26T19:42:36Z
jcaa:ART
driver
nmb a2200000Iu 4500
"820101 1982 eng "
2291-1391
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dc
Acoustical Engineering Work in Prevention Services
Griffioen, R. R.
Engineering & Research, Prevention Services Workers' Compensation Board of British Columbia 5255 Heather St., Vancouver, B.C. V5Z 3L8
This is the second of three articles on acoustical activities in the Workers' Compensation Board of British Columbia. In this article, R. Griffioen, P. Eng., group leader for Acoustics for the Engineering and Research Section of Prevention Services covers the activities of his group.
Canadian Acoustical Association / Association canadienne d'acoustique
1982-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/475
Canadian Acoustics; Vol. 10 No. 1 (1982)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/476
2012-12-26T19:42:36Z
jcaa:ART
driver
nmb a2200000Iu 4500
"820101 1982 eng "
2291-1391
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Hearing Conservation in British Columbia
Gannon, P.
Hearing Branch Workers' Compensation Board of British Columbia
This is the third of three articles on acoustical activities of the Workers’ Compensation Board of British Columbia. Dr. Pat Gannon describes the work of the Hearing Branch on hearing conservation.
Canadian Acoustical Association / Association canadienne d'acoustique
1982-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/476
Canadian Acoustics; Vol. 10 No. 1 (1982)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/477
2012-12-26T19:42:37Z
jcaa:ART
driver
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"820101 1982 eng "
2291-1391
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Review of sound propagation in the atmosphere
Piercy, J.E.
Div. of Phys., Nat. Res. Council of Canada, Ottawa, Ont., Canada
Embleton, T.F.W.
Div. of Phys., Nat. Res. Council of Canada, Ottawa, Ont., Canada
Advances in the understanding of the mechanisms of outdoor sound propagation during the last five years which are relevant to community noise problems are discussed, and an attempt made to fit them into a consistent overall picture. One aspect is studies of ground impedance and the relevance of modelling the ground plane by a semi-infinite porous medium. Another is the contribution of theoretical papers on propagation from a point source through a homogeneous atmosphere over a plane of finite impedance. A third is the effect of atmospheric inhomogeneity-most notably scattering by turbulence and refraction by the thin (~10 cm) thermal boundary layer close to the ground. The attenuation of barriers is also discussed including the application of modern theory to diffraction over the top, interference effects produced by reflection from the ground, and scattering down into the diffractive shadow zone by turbulence
Canadian Acoustical Association / Association canadienne d'acoustique
1982-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/477
Canadian Acoustics; Vol. 10 No. 1 (1982)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/478
2012-12-26T19:42:38Z
jcaa:ART
driver
nmb a2200000Iu 4500
"820101 1982 eng "
2291-1391
0711-6659
dc
Report of the CAA Toronto Chapter
Krajewski, C. A.
Canadian Acoustical Association / Association canadienne d'acoustique
1982-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/478
Canadian Acoustics; Vol. 10 No. 1 (1982)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/479
2012-12-26T19:42:38Z
jcaa:ART
driver
nmb a2200000Iu 4500
"820101 1982 eng "
2291-1391
0711-6659
dc
Fight against noise, dwellings in France
Josse, R.
Centre Sci. et Tech. de Batiment, Grenoble, France
For several years a considerable effort has been made in France to ensure good sound isolation between new dwellings, as well as against the intrusion of outdoor noises. The effort has been carried out in the following areas: regulations, labelling, controls and sanctions, scientific and technical research, and the publication of examples of solutions. The different aspects of this effort against noise are examined in detail.
Canadian Acoustical Association / Association canadienne d'acoustique
1982-01-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/479
Canadian Acoustics; Vol. 10 No. 1 (1982)
eng
Copyright (c)
oai:jcaa.caa-aca.ca:article/480
2012-12-26T19:42:39Z
jcaa:ART
driver
nmb a2200000Iu 4500
"820401 1982 eng "
2291-1391
0711-6659
dc
Examination of the Effect of Source Location on Sound Power Measurements
Rennie, James
SNC Group, Environment Division Montreal, Quebec
Lang, Mark A.
Centre for Building Studies Concordia University, Montreal, Québec
The influence of source location and room modifiers are examined with respect to the effectiveness of source position averaging in reducing measurement error for sound power measurements in reverberation rooms.
Canadian Acoustical Association / Association canadienne d'acoustique
1982-04-01 00:00:00
application/pdf
https://jcaa.caa-aca.ca/index.php/jcaa/article/view/480
Canadian Acoustics; Vol. 10 No. 2 (1982)
eng
Copyright (c)
720b0239526635c16623bee0e5e596bc