Microphone arrays for hearing aids: an overview

Authors:
Bernard Widrow;Fa-Long Luo
Affiliations:
Packard Electrical Engineering Building, Room 273, Stanford University, 350 Serra Mall, Stanford, CA;Quicksilver Technology, Inc., 6640 Via Del Oro, San Jose, CA
Venue:
Speech Communication - Special issue on speech processing for hearing aids
Year:
2003

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Abstract

Using the difference in the spatial domain (direction or location) between a target signal and noise, a system with a microphone array can achieve the goal of noise reduction and speech enhancement in various environments, especially, in speech-like noisy environments. This paper deals with various issues related to the use of microphone arrays in hearing aids. It includes overall principles, algorithms, real-time implementation, configuration, processing mode, geometry, combination with binaural processing, directivity pattern, frequency responses, and compensation for mismatch and misplacement of microphones. A practical microphone array device will be presented that uses microphone array based processing techniques to help hearing aids deliver improvement in signal-to-noise ratio, reduction of the effects of reverberation, and reduction of the feedback, with appropriate configuration and connections.