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Journal Article

Microphone Arrays for Improving Speech Intelligibility in a Reverberant or Noisy Space

Authors: Nomura, Hiroaki; Miyata, Hiroyuki; Houtgast, Tammo

Journal of the Audio Engineering Society · Volume 41 · Issue 10 · pp. 771–781 · October 1993

Abstract

In a diffuse sound field, speech intelligibility increases as the ratio of direct to reverberant sound energy (D/R) or the energy ratio of direct sound to noise (D/N) increases. It is described how the D/R or the D/N can be increased using a microphone array to improve speech intelligibility in a reverberant or noisy space. The theoretical increase in D/R or D/N obtained by spherical or circular microphone array is confirmed by measuring the rapid speech transmission index (RASTI) under reverberant or noisy conditions. Speech intelligibility tests are also performed in a reverberant or noisy room to confirm the increase in speech intelligibility scores. These results show that the intelligibility of speech in auditoriums or teleconferencing systems can be improved significantly by using these types of microphone arrays.

Details

Publication
Journal of the Audio Engineering Society
Volume
41
Issue
10
Pages
771–781
Publication date
October 6, 1993
Affiliation
NTT Human Interface Laboratories, Musashino-shi, Tokyo, Japan ; TNO Institute for Perception, Soesterberg, The Netherlands (See document for exact affiliation information.)
Type
Journal Article