Abstract
Experiments have shown [A. J. Duquesnoy and R. Plomp, J. Acoust. Soc. Am. 68, 537–544 (1980)] that the Speech Transmission Index (STI), derived from the modulation transfer function, can be used to describe the combined effect of noise and reverberation on speech intelligibility by hearing‐impaired subjects. Every 3‐dB hearing loss for speech in noise (elevation of the speech‐reception threshold in terms of S/N ratio re speech‐reception threshold for normal‐hearing subjects) can be compensated for by an increase of 0.1 in STI. For an auditorium or classroom, this increase can be obtained by reducing the reverberation time with not less than 58%. Since many hearing‐impaired subjects have hearing losses. for speech in noise larger than 3 dB, we may conclude that they need very low reverberation times.
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