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Robust adaptive microphone array processing for hearing aids: realistic speech enhancement

M W Hoffman1, T D Trine, K M Buckley

  • 1Department of Electrical Engineering, University of Nebraska, Lincoln 68588-0511.

The Journal of the Acoustical Society of America
|August 1, 1994
PubMed
Summary
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This study investigates microphone arrays for hearing aids, predicting realistic performance gains over single microphones. Results show microphone arrays significantly improve speech reception thresholds (SRT) and signal-to-noise ratios (SNRs).

Area of Science:

  • Acoustics
  • Signal Processing
  • Hearing Aid Technology

Background:

  • Hearing aids traditionally use single microphones, limiting performance in noisy environments.
  • Combining multiple microphone outputs (microphone arrays) offers potential for improved speech intelligibility.
  • Predicting realistic performance gains is crucial for developing effective hearing aid technologies.

Purpose of the Study:

  • To investigate combining microphone array outputs for hearing aid input.
  • To conservatively predict achievable performance gains of microphone arrays over single microphones.
  • To evaluate array performance using speech reception threshold (SRT) and signal-to-noise ratio (SNR) changes.

Main Methods:

  • Performance improvement measured by change in SRT between single and multi-microphone conditions.

Related Experiment Videos

  • Utilized intelligibility averaged gain and signal-to-noise ratios (SNRs) to evaluate array performance.
  • Investigated effects of acoustic headshadow, room reverberation, and placement uncertainties.

    • Main Results:

    • Predictions using intelligibility averaged gain correlate well with actual SRT changes.
    • Robust adaptive microphone array processors offer realistic speech enhancement.
    • Performance improvements demonstrated for fixed, block processed, and adaptive spatial filters.

    Conclusions:

    • Microphone arrays provide significant, realistic speech enhancement for hearing aids.
    • Robust block processed array performance is achievable with adaptive implementations.
    • Beamformer design criteria limit desired signal cancellation, ensuring robust performance.