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Amplitude compression and profound hearing loss.

A Boothroyd1, N Springer, L Smith

  • 1City University of New York.

Journal of Speech and Hearing Research
|September 1, 1988
PubMed
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Amplitude compression in hearing aids may not benefit most individuals with profound hearing loss. While one subject improved, eight showed reduced speech pattern perception, suggesting compression can be detrimental.

Area of Science:

  • Audiology
  • Speech Perception
  • Hearing Loss

Background:

  • Sensorineural hearing loss impacts speech pattern contrast perception.
  • Hearing aid amplification strategies aim to improve audibility and speech understanding.

Purpose of the Study:

  • To investigate the effects of amplitude compression on speech pattern contrast perception in subjects with prelingual hearing loss.
  • To compare hearing aid performance with and without amplitude compression.

Main Methods:

  • Nine subjects with prelingual sensorineural hearing loss participated.
  • A three-interval, forced-choice speech pattern contrast test was administered.
  • Two amplification conditions were tested: without compression and with 30 dB dynamic range compression.

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Main Results:

  • One subject demonstrated significantly improved performance with amplitude compression.
  • Eight subjects showed a small but significant decrease in performance with compression.
  • Positive effects were attributed to increased audibility; negative effects to distorted time-intensity cues.

Conclusions:

  • Amplitude compression may be unnecessary or detrimental for most profoundly deaf individuals.
  • Compression could potentially benefit a subset of individuals with hearing loss.
  • Optimized amplification without compression may be sufficient for many.