Windscreen insertion loss in still air

Authors

  • Richard J. Peppin Scantek, Inc., 7060 Oakland Mills Rd. No. L, Columbia, MD 21046, United States

Keywords:

Acoustic impedance, Attenuation, Audio acoustics, Insertion losses, Microphones, Windshields, Microphone windscreens

Abstract

Microphone windscreens are used to attenuate wind noise. However, even in still air, windscreens have an impact due to the added impedance between the source and microphone. This impedance is not accounted for when the system is checked by the use of an acoustical calibrator or when used in the field. The procedure for the characterization of the attenuation in still air has recently been addressed in ANSI S 1.17-2000 part 1. But to date, no commercial windscreens have been tested in accordance with that standard. One of the reasons may be because the precision of the procedure has not been determined, even though the results of a round robin and the results of the uncertainty determination are available. Some of the commonly used windscreens were tested in a small chamber approaching free-field conditions. The results of the tests of insertion loss from the non-standard method and those based on S1.17 are presented here. It is shown that in some cases, the use of a windscreen can easily change the measurements using Type 1 instruments to Type 2 or worse. Without knowing information about a particular windscreen, the use of a windscreen in still air, can drastically change uncertainty of measurement. In moving air conditions can be expected to be even more severe.

Downloads

Published

2003-03-01

How to Cite

1.
Peppin RJ. Windscreen insertion loss in still air. Canadian Acoustics [Internet]. 2003 Mar. 1 [cited 2023 Mar. 21];31(1):25-31. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1519

Issue

Vol. 31 No. 1 (2003)

Section

Technical Articles

License

Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i)    to publish, reproduce, distribute, display and store the Contribution;
ii)    to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii)    to exploit all subsidiary rights in the Contribution,
iv)    to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v)    to licence any third party to do any or all of the above.