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Related Experiment Videos

Adaptive feedback cancellation with frequency compression for hearing aids

H A Joson1, F Asano, Y Suzuki

  • 1Research Institute of Electrical Communication, Tohoku University, Sendai, Japan.

The Journal of the Acoustical Society of America
|December 1, 1993
PubMed
Summary

This study introduces a frequency compressor to improve adaptive feedback cancelers (AFCs) for hearing aid howling suppression. The novel approach enhances the howling margin by 18 dB with minimal signal quality loss.

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Area of Science:

  • Audiology
  • Signal Processing
  • Acoustics

Background:

  • Hearing aids often suffer from acoustic feedback, leading to howling.
  • Adaptive feedback cancelers (AFCs) are effective for howling suppression but require a reference signal correlated with feedback, not the input signal.
  • Obtaining such a reference signal in hearing aids is challenging.

Purpose of the Study:

  • To propose and evaluate a frequency compressor as a decorrelator for adaptive feedback cancelers (AFCs) in hearing aids.
  • To improve howling suppression while minimizing input signal cancellation.

Main Methods:

  • A frequency compressor was integrated into an AFC system to decorrelate the output signal from the input signal.
  • The proposed system's performance was investigated through digital simulations.

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  • System parameters were optimized to balance howling suppression and signal quality.

    • Main Results:

    • The proposed system achieved an 18 dB increase in the howling margin.
    • Minimal deterioration in output signal quality was observed with proper parameter selection.
    • The frequency compressor effectively decorrelated the reference signal from the input signal.

    Conclusions:

    • The integration of a frequency compressor is a viable method for enhancing AFC performance in hearing aid howling suppression.
    • This technique offers a significant improvement in the howling margin without compromising audibility.
    • The proposed system provides a practical solution for feedback issues in hearing aids.