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Adaptive feedback stabilization of hearing aids

A M Engebretson1, M French-St George, M P O'Connell

  • 1Department of Computer Science, Washington University, St. Louis, MO 63130.

Scandinavian Audiology. Supplementum
|January 1, 1993
PubMed
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This study introduces a digital hearing aid algorithm that stabilizes systems by adaptively equalizing the feedback path. Laboratory tests show this method increases stable gain margin in Behind-The-Ear (BTE) hearing aids.

Area of Science:

  • Audiology
  • Digital Signal Processing
  • Biomedical Engineering

Background:

  • Hearing aid feedback, or acoustic gain loss, can limit device performance.
  • Adaptive algorithms are crucial for real-time system stabilization in hearing aids.

Purpose of the Study:

  • To develop and validate a novel method for adaptively identifying and equalizing the hearing aid feedback path.
  • To enhance system stability and increase the available gain margin in hearing aid devices.

Main Methods:

  • Implementation of a Least Mean Squares (LMS) adaptive filter algorithm in a digital format.
  • Utilizing a custom Very Large Scale Integration (VLSI) circuit for real-time processing.
  • Laboratory experiments conducted with hearing-impaired subjects.

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Main Results:

  • Demonstrated successful adaptive identification and equalization of the hearing aid feedback path.
  • Achieved an additional 10 to 15 dB of stable gain margin in a Behind-The-Ear (BTE) hearing aid configuration.
  • Validated the effectiveness of the digital algorithm and VLSI implementation.

Conclusions:

  • The developed adaptive feedback equalization method significantly improves hearing aid stability.
  • The approach offers a practical solution for increasing gain in BTE hearing aids, benefiting users.
  • Digital implementation and VLSI technology are viable for advanced hearing aid signal processing.