The effect of ambient noise on speech intelligibility in classrooms |
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Authors: | T Houtgast |
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Institution: | Institute for Perception, TNO, Soesterberg The Netherlands |
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Abstract: | Intelligibility tests were performed by teachers and pupils in classrooms under a variety of (road traffic) noise conditions. The intelligibility scores are found to deteriorate at (indoor) noise levels exceeding a critical value of — 15 dB with regard to a teacher's long-term (reverberant) speech level. The implications for external noise levels are discussed: typically, an external noise level of 50 dB(A) would imply that the critical indoor level is exceeded for about 20 per cent of teachers. |
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