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The effect of multichannel dynamic compression on speech intelligibility

V Hohmann1, B Kollmeier

  • 1Drittes Physikalisches Institut, Universität Göttingen, Germany.

The Journal of the Acoustical Society of America
|February 1, 1995
PubMed
Summary

Fast multichannel compression in hearing aids can harm speech intelligibility for normal hearing listeners in noisy environments. However, it may not significantly decrease intelligibility in quieter settings, though speech quality may suffer.

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Area of Science:

  • Audiology
  • Speech processing
  • Hearing aid technology

Background:

  • Dynamic compression in hearing aids is debated, particularly multichannel compression with short time constants.
  • Previous research has not fully clarified the impact of fast multichannel compression on speech perception.

Purpose of the Study:

  • To investigate the effects of fast multichannel compression on speech intelligibility and quality in normal hearing listeners.
  • To evaluate the applicability of the Speech Transmission Index (STI) for compressed speech.

Main Methods:

  • Experimental study involving normal hearing listeners.
  • Presentation of speech stimuli with varying signal-to-noise ratios (SNRs) and compression settings.
  • Assessment of speech intelligibility and speech quality.

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Main Results:

  • Fast multichannel compression negatively impacted speech intelligibility at low SNRs.
  • At high SNRs, speech quality degraded, but intelligibility remained largely unaffected with compression ratios up to 3.
  • The Speech Transmission Index (STI) predictions diverged significantly from experimental findings.

Conclusions:

  • Fast multichannel compression can be detrimental to speech intelligibility in challenging listening conditions.
  • The effectiveness of STI as an objective measure for compressed speech is questionable.
  • Further research is needed to optimize hearing aid compression strategies for diverse listening environments.