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Speech intelligibility and localization in a multi-source environment.

M L Hawley1, R Y Litovsky, H S Colburn

  • 1Hearing Research Center, Boston University, Massachusetts 02215, USA. MLH@bu.edu

The Journal of the Acoustical Society of America
|June 25, 1999
PubMed
Summary
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Spatially separating target speech from competing speech significantly improves intelligibility and localization. Binaural listening offers substantial benefits, especially in complex acoustic environments for speech perception.

Area of Science:

  • Auditory perception
  • Acoustic signal processing
  • Human factors in acoustics

Background:

  • Natural environments contain interfering sounds impacting auditory information extraction.
  • Speech intelligibility and localization are crucial for listeners in complex acoustic scenes.

Purpose of the Study:

  • To investigate speech intelligibility and localization in normal-hearing listeners with competing speech.
  • To compare performance in actual versus virtual sound fields under different listening conditions.

Main Methods:

  • Experiments involved presenting target and competing sentences in various spatial configurations.
  • Speech intelligibility and source identification were measured in actual and virtual sound fields.
  • Binaural and monaural listening conditions were tested in the virtual sound field.

Related Experiment Videos

Main Results:

  • Spatial separation of target and competing speech significantly improved intelligibility.
  • Speech intelligibility was similar in actual and virtual sound fields (binaural).
  • Localization performance was better in actual sound fields than virtual ones, but good binaurally even with multiple competitors.

Conclusions:

  • Spatial separation is key for enhancing speech intelligibility and localization in noisy environments.
  • Binaural hearing provides significant advantages, though monaural listening can suffice in some scenarios.
  • Localization ability did not limit speech intelligibility performance in these experiments.