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Multiband compression limiting for hearing-impaired listeners.

D K Bustamante1, L D Braida

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139.

Journal of Rehabilitation Research and Development
|January 1, 1987
PubMed
Summary
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Compression limiting in hearing aids improves speech intelligibility at lower input levels for hearing-impaired listeners. However, spectral degradations can reduce intelligibility at higher input levels compared to linear amplification.

Area of Science:

  • Audiology
  • Speech Processing
  • Hearing Science

Background:

  • Hearing aids utilize amplification and compression to aid hearing-impaired individuals.
  • Understanding the impact of different compression strategies on speech intelligibility is crucial.

Purpose of the Study:

  • To compare the speech intelligibility provided by multiband compression limiters versus linear amplification systems.
  • To evaluate the effect of different limiting and frequency-gain characteristics on speech perception.

Main Methods:

  • Two hearing-impaired listeners evaluated consonant-vowel-consonant (CVC) nonsense syllables.
  • Four multiband compression limiters and two linear amplification systems were tested.
  • Subjects selected listening levels for optimal intelligibility and comfort across a 30 dB input range.

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Main Results:

  • Compression limiting increased selected gain by 5-11 dB compared to linear amplification.
  • Linear amplification showed a 34-percentage-point drop in scores as input level decreased.
  • Compression limiting maintained comparable maximum scores but reduced score variability across input levels (9-22 percentage points).

Conclusions:

  • Compression limiting enhances speech intelligibility at low input levels for hearing-impaired listeners.
  • Spectral degradations from multiband compression may reduce intelligibility at high input levels.
  • Compression strategies offer benefits in managing varying input levels, but potential drawbacks exist.