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Constrained adaptation for feedback cancellation in hearing aids.

¹AudioLogic, Boulder, Colorado 80301, USA.

The Journal of the Acoustical Society of America

|August 27, 1999

Summary

This study introduces constrained adaptation methods for hearing aid feedback cancellation filters. These methods effectively prevent the filter from canceling narrow-band input signals, improving hearing aid performance.

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Area of Science:

Audiology
Signal Processing
Biomedical Engineering

Background:

Hearing aids utilize adaptive filters to model feedback paths for cancellation.
Current methods can cause signal cancellation and coloration artifacts with narrow-band inputs.

Purpose of the Study:

To develop and evaluate new adaptive filter procedures for hearing aid feedback cancellation.
To mitigate signal cancellation and coloration artifacts in hearing aids.

Main Methods:

Derived two procedures for Least Mean Squares (LMS) adaptation with constraints on the adaptive weight vector magnitude.
Simulated the performance of the constrained adaptation methods.

Main Results:

Constrained adaptation significantly reduces the likelihood of the adaptive filter canceling narrow-band input signals.
Simulations demonstrated the effectiveness of the proposed constrained adaptation techniques.

Conclusions:

Constrained adaptation is a viable strategy to improve the robustness of hearing aid feedback cancellation.
The developed methods enhance hearing aid performance by preventing unwanted cancellation of desired audio signals.

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