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Improving misalignment for feedback path estimation in hearing aid by multiple short-time noise injections.

Soudeh A Khoubrouy1, Issa M S Panahi

  • 1IEEE.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
Summary

Adaptive feedback cancellation (AFC) in hearing aids uses noise injection to estimate the feedback path. Shorter filters can balance performance and complexity, with averaging improving accuracy.

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Area of Science:

  • Acoustics and Signal Processing
  • Hearing Aid Technology
  • Biomedical Engineering

Background:

  • Acoustic feedback between loudspeakers and microphones in hearing aids degrades performance.
  • Adaptive Feedback Cancellation (AFC) methods are crucial for mitigating this feedback.
  • The order or length of the AFC filter significantly impacts system performance and computational complexity.

Purpose of the Study:

  • To investigate the optimal length of AFC filters for hearing aids.
  • To propose a noise injection method for estimating the feedback path and determining filter length.
  • To enhance the performance of AFC systems using averaging techniques.

Main Methods:

  • Utilizing a noise injection method to estimate the hearing aid's acoustic feedback path.

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  • Analyzing the trade-off between filter length, system quality, and complexity.
  • Implementing a multiple short-time noise injections and averaging strategy.

    • Main Results:

    • The optimal AFC filter length may be shorter than the actual feedback path length, offering a balance between quality and complexity.
    • The proposed noise injection method effectively estimates the feedback path model.
    • Averaging multiple short-time noise injections improves the filter estimate's accuracy (Misalignment criterion).

    Conclusions:

    • A shorter, optimized AFC filter length can achieve a favorable balance between hearing aid performance and system complexity.
    • The noise injection and averaging technique provides a robust method for determining appropriate AFC filter lengths.
    • This approach enhances the overall effectiveness of adaptive feedback cancellation in hearing aid devices.