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An evaluation of two signal-processing hearing aids.

J J Dempsey1, T G Linzalone

  • 1Department of Speech, Communication Sciences, and Theatre, St. John's University, Jamaica, NY 11439.

Journal of Communication Disorders
|June 1, 1991
PubMed
Summary

Modern hearing aids use advanced signal processing. Adaptive compression in hearing aids significantly improved sentence recognition compared to high-pass filters in noisy environments for hearing-impaired individuals.

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Area of Science:

  • Audiology
  • Signal Processing
  • Hearing Science

Background:

  • Modern hearing aids utilize diverse signal processing techniques.
  • Understanding the impact of specific signal processing on speech recognition is crucial for hearing aid development.

Purpose of the Study:

  • To compare the effectiveness of two signal processing strategies in hearing aids.
  • To investigate the relationship between sentence recognition and adaptive compression versus adaptive high-pass filtering.

Main Methods:

  • Evaluated sentence recognition ability in participants with hearing impairments.
  • Utilized commercially available hearing aids with adaptive compression (variable release time) and adaptive high-pass filter (short attack/release times).
  • Collected data in a single-talker competing message scenario across various message-to-competition ratios.

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Main Results:

  • A significant improvement in sentence recognition was observed with adaptive compression compared to the adaptive high-pass filter.
  • The adaptive compression system demonstrated superior performance in specific background noise conditions.

Conclusions:

  • Adaptive compression, particularly with variable release times, offers significant benefits for hearing-impaired listeners.
  • This signal processing approach may enhance speech intelligibility in challenging auditory environments with background noise.