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Related Experiment Videos

Coherence and the speech intelligibility index.

James M Kates1, Kathryn H Arehart

  • 1GN ReSound and University of Colorado, Department of Speech Language and Hearing Sciences, 409 UCB, Boulder, Colorado 80309, USA. jkates@gnresound.dk

The Journal of the Acoustical Society of America
|May 19, 2005
PubMed
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This study extends the Speech Intelligibility Index (SII) to account for clipping distortion. A new method using signal coherence in different speech levels improves intelligibility predictions for listeners with normal and impaired hearing.

Area of Science:

  • Acoustics
  • Psychoacoustics
  • Signal Processing

Background:

  • The Speech Intelligibility Index (SII) estimates intelligibility with noise or bandwidth reduction.
  • Existing SII methods do not fully address signal distortion effects.

Purpose of the Study:

  • To extend the SII to include peak-clipping and center-clipping distortion.
  • To validate the extended SII using intelligibility scores from human listeners.

Main Methods:

  • Developed a coherence-based SII to quantify distortion.
  • Divided speech into low-, mid-, and high-level regions.
  • Combined regional coherence SII values for overall prediction.

Main Results:

  • The coherence-based SII accurately predicted intelligibility for noise and clipping conditions.

Related Experiment Videos

  • The proposed method showed improved prediction over standard SII for distorted speech.
  • Normal-hearing and hearing-impaired listeners' scores validated the model.

    • Conclusions:

    • The extended SII, incorporating signal coherence, effectively estimates speech intelligibility under various noise and distortion conditions.
    • This approach offers a more comprehensive tool for audiological applications and hearing aid design.