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Related Experiment Videos

Evaluation of a dereverberation technique.

A C Neuman1, L Eisenberg

  • 1Center for Research in Speech and Hearing Sciences, Graduate School, City University of New York, NY 10036.

Journal of Communication Disorders
|June 1, 1991
PubMed
Summary

A two-microphone dereverberation technique did not improve speech recognition for normal-hearing or hearing-impaired listeners. Binaural presentation was superior to monaural processing for both groups.

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Area of Science:

  • Audiology
  • Acoustics
  • Signal Processing

Background:

  • Reverberation degrades speech intelligibility, particularly for hearing-impaired individuals.
  • Advanced signal processing techniques aim to mitigate reverberation effects.
  • Evaluating these techniques requires assessing both objective performance and subjective preference.

Purpose of the Study:

  • To evaluate a two-microphone dereverberation technique.
  • To compare speech recognition and listener preference for processed versus unprocessed speech.
  • To assess performance in normal-hearing and hearing-impaired listeners.

Main Methods:

  • Speech recognition tests were conducted under different reverberation conditions (0.4s, 1.2s).
  • Monaural and binaural listening conditions were tested with and without dereverberation processing.
  • Paired-comparison judgments assessed listener preference for processed versus unprocessed stimuli.

Main Results:

  • Speech recognition scores decreased significantly with increased reverberation time for both listener groups.
  • Dereverberation processing did not significantly improve monaural speech recognition for normal-hearing listeners.
  • Hearing-impaired listeners performed better with unprocessed signals than processed monaural signals, but binaural presentation showed no significant difference.
  • Listener preferences differed between normal-hearing and hearing-impaired groups.

Conclusions:

  • The evaluated two-microphone dereverberation technique did not enhance speech recognition performance for either normal-hearing or hearing-impaired listeners.
  • Binaural presentation of unprocessed speech was superior to monaural processed speech for both groups.
  • Listener preferences varied, suggesting different perceptual priorities between normal-hearing and hearing-impaired individuals regarding dereverberation.

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