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Speech distortion measures for hearing aids.

M J Williamson1, K L Cummins, K E Hecox

  • 1Project Phoenix of Madison, Inc., Wisconsin 53711-0287.

Journal of Rehabilitation Research and Development
|January 1, 1987
PubMed
Summary
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New methods analyze hearing aid distortion using a time-varying filter model. This approach categorizes distortion, offering a comprehensive analysis of electroacoustic performance for digital hearing aids.

Area of Science:

  • Audiology
  • Acoustics
  • Signal Processing

Background:

  • Digital technology advancements introduce new distortion types in hearing aids.
  • Existing electroacoustic distortion measures may not fully capture these new distortions.

Purpose of the Study:

  • To develop and validate supplementary measures for analyzing electroacoustic distortion in hearing aids.
  • To create a model for separating distortion into perceptually relevant and irrelevant components.

Main Methods:

  • Formulated a mathematical model of a hearing aid as a time-varying linear filter.
  • Processed digitized speech through a commercial hearing aid, comparing output to the model.
  • Derived performance measures by comparing input and output waveforms.
  • Visualized distortion in three dimensions (time, frequency, amplitude).

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Main Results:

  • Developed a comprehensive and generalizable format for analyzing hearing aid distortion.
  • Demonstrated a method to differentiate between perceptually relevant and irrelevant distortion.
  • Quantified distortion characteristics across time, frequency, and amplitude.

Conclusions:

  • The proposed model and measures offer a more thorough analysis of hearing aid electroacoustic distortion.
  • This approach is valuable for understanding and mitigating distortion in modern digital hearing aids.