Prediction of speech intelligibility for public address systems in traffic tunnels

article

Wijngaarden, S.J. van

Verhave, J.A.
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.
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Crowd evacuationSmokeOrientationSafetyRunnel evacuationIntelligibilityPredictionSTITunnelsEstimationPublic address systemsRay tracingReverberationSpeech transmissionStatistical methodsIntelligibilityPredictionSpeech transmission indexSTISpeech intelligibility
TNO Identifier
15961
Repository link
https://resolver.tno.nl/uuid:8967e019-5130-4b16-866d-f7f00f550949
Source
Applied Acoustics, 67(4), pp. 306-323.
Pages
306-323
Files
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