Quantifying public address system performance in a public transit environment

Auteurs-es

  • Tim Kelsall INCE Bd. Cert., Hatch, 2800 Speakman Drive, Mississauga, Ont. L5K 2R7, Canada
  • M. Fitzmaurice INCE Bd. Cert., Hatch, 2800 Speakman Drive, Mississauga, Ont. L5K 2R7, Canada

Mots-clés :

Acoustics, Computer software, Loudspeakers, Reverberation, Speech intelligibility, Speech transmission, Speech transmission index (STI)

Résumé

The Toronto Transit Commission (TTC) new Sheppard subway line is nearly complete. It adds 5 new stations and 6.4 km of tunnel to their system. From the beginning of the overall design of the stations, efforts were made to ensure the public would be able to understand public address(PA)announcements during revenue service and in emergency situations. The PA system design goal was a speech transmission index (STI) of 0.45 or 'Fair' intelligibility. As each station is completed, it is being measured using Maximum Length Sequences in a PC based measurement system in order to validate the performance of the PA and the station architectural treatment. The paper will discuss the PA system used, summarize the measurements, provide some assessment as to the performance of acoustic treatments used in the station finishes as well as comment upon the practical aspects of using the Dirac measurement system.

Fichiers supplémentaires

Publié-e

2002-09-01

Comment citer

1.
Kelsall T, Fitzmaurice M. Quantifying public address system performance in a public transit environment. Canadian Acoustics [Internet]. 1 sept. 2002 [cité 19 févr. 2025];30(3):40-1. Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1444

Numéro

Vol. 30 No. 3 (2002)

Rubrique

Actes du congrès de la Semaine canadienne d'acoustique

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