Title
Prediction of speech intelligibility for public address systems in traffic tunnels
Author
van Wijngaarden, S.J.
Verhave, J.A.
TNO Defensie en Veiligheid
Publication year
2006
Abstract
Traffic tunnels are generally hostile acoustic environments, both in terms of reverberation and ambient noise levels. Public address (PA) systems used to convey spoken warnings must meet stringent design requirements in order to produce sufficiently intelligible speech. To be able to predict PA system performance at tunnel design time, two di.erent speech transmission index (STI) calculation procedures were implemented. The first procedure predicts the STI based on ray-tracing simulations. Comparison with measured STI data showed that this simulation approach yields accurate intelligibility estimates. However, the procedure is time-consuming and too complex to be used by non-specialists. For this reason, a second (simpler and more efficient) procedure was developed, based on fixed non-linear regression, statistically deriving prediction functions from measured data and ray-tracing results. This procedure was compared to the approach based on ray tracing, and found to yield STI predictions closely matching those of the ray-tracing model.
Subject
Acoustics and Audiology Traffic
Crowd evacuation
Smoke
Orientation
Safety
Runnel evacuation
Intelligibility
Prediction
STI
Tunnels
Estimation
Public address systems
Ray tracing
Reverberation
Speech transmission
Statistical methods
Intelligibility
Prediction
Speech transmission index
STI
Speech intelligibility
To reference this document use:
http://resolver.tudelft.nl/uuid:8967e019-5130-4b16-866d-f7f00f550949
DOI
https://doi.org/10.1016/j.apacoust.2005.07.001
TNO identifier
15961
Source
Applied Acoustics, 67 (4), 306-323
Document type
article