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A comparison of hearing-aid array processing techniques

J M Kates¹, M R Weiss

¹Center for Research in Speech and Hearing Sciences, City University of New York, New York 10036, USA.

The Journal of the Acoustical Society of America

|May 1, 1996

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Digital microphone array processing significantly enhances speech intelligibility for hearing aid users. Superdirective and adaptive digital arrays offer over 9 dB of weighted array gain, outperforming analog methods.

Area of Science:

Acoustics
Signal Processing
Hearing Aid Technology

Background:

Microphone arrays improve speech intelligibility for hearing-impaired listeners.
Various array processing techniques exist, including delay-and-sum, superdirective, and adaptive arrays.

Purpose of the Study:

To directly compare the effectiveness of different microphone array processing strategies for hearing aids.
To evaluate digital versus simulated analog processing techniques.

Main Methods:

A 10-cm linear array with five microphones was used in an end-fire orientation.
Speech and noise signals were acquired in two rooms with varying array placements.
Frequency-domain processing was employed, with performance measured by weighted array gain.

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Main Results:

Digital processing systems were more effective than simulated analog processing.
Both superdirective and adaptive digital array processing achieved over 9 dB of weighted array gain.

Conclusions:

Digital superdirective and adaptive array processing offer substantial improvements in speech intelligibility for hearing aid applications.
These advanced digital techniques provide superior performance compared to traditional analog methods.