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Multichannel compression, temporal cues, and audibility

P E Souza1, C W Turner

  • 1Department of Speech and Hearing Sciences, University of Washington, Seattle 98105, USA. psouza@u.washington.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|May 7, 1998
PubMed
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Multichannel compression in hearing aids offers benefits when audibility is improved. However, it does not significantly enhance speech recognition when audibility is matched, and extreme compression can impair temporal processing.

Area of Science:

  • Audiology
  • Speech Processing
  • Hearing Aid Technology

Background:

  • Multichannel compression is increasingly used in hearing aids, but its benefits over conventional amplification are inconsistent.
  • Previous research may be confounded by audibility differences and alterations to temporal speech information.

Purpose of the Study:

  • To investigate the impact of audibility and temporal information on speech recognition with multichannel compression.
  • To compare multichannel compression with linear amplification in listeners with hearing loss and normal hearing.

Main Methods:

  • Speech recognition was measured using linearly amplified and multichannel-compressed speech.
  • A signal-correlated noise (SCN) stimulus was used to isolate the use of temporal information.
  • Audibility was controlled by measuring short-term level differences between conditions.

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Main Results:

  • Multichannel compression improved speech recognition when it provided superior audibility compared to linear amplification.
  • When audibility was matched, multichannel compression showed no significant benefit for speech with temporal and spectral cues.
  • Extreme multichannel compression settings reduced the utilization of temporal information, as shown by SCN results.

Conclusions:

  • The benefit of multichannel compression depends on audibility improvements.
  • When audibility is equivalent, multichannel compression does not enhance speech recognition for spectro-temporal cues.
  • Excessive multichannel compression can negatively impact the processing of temporal speech information.