Room acoustics for the aged

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Abstract
This article deals with the combined effects of noise and reverberation on the speech‐reception threshold for sentences. It is based on a series of current investigations on: (1) the modulation‐transfer function as a measure of speech intelligibility in rooms, (2) the applicability of this concept to hearing‐impaired persons, and (3) hearing loss for speech in quiet and in noise as a function of age. It is shown that, generally, in auditoria,classrooms, etc. the reverberation time T, acceptable for normal‐hearing listeners, has to be reduced to (0.75) D T in order to be acceptable for elderly subjects with a hearing loss of D dB for speech in noise; for listening conditions as in lounges, restaurants, etc. the corresponding value is (0.82) D T.

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