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Journal of Speech and Hearing Disorders Vol.49 278-286 August 1984.
© American Speech-Language-Hearing Association
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Signal-to-Noise Ratio Advantage of Binaural Hearing Aids and Directional Microphones under Different Levels of Reverberation

David B. Hawkins 1 and William S. Yacullo 1

1 University of Iowa

The signal-to-noise ratio necessary for a constant performance level was determined for normally hearing and hearing-impaired subjects under three levels of reverberation (0.3, 0.6, and 1.2 s) with monaural and binaural hearing aids having directional and omnidirectional microphones. Results indicated (a) a significant binaural advantage (2–3 dB) which was independent of microphone type and reverberation time, (b) a significant directional microphone advantage (3–4 dB) which was independent of hearing aid arrangement (monaural or binaural) but dependent on level of reverberation, (c) a significant reverberation effect which was larger than either the binaural or directional microphone effect, and (d) additive binaural and directional microphone advantages. The results suggest that the signal-to-noise ratio is optimized when binaural hearing aids with directional microphones are used in rooms with short reverberation times.

Submitted on September 26, 1983
Accepted on May 7, 1984




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