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Speech perception from monaural and binaural information.

John F Culling1, Barrie A Edmonds, Kathryn I Hodder

  • 1School of Psychology, Cardiff University, Tower Building, Park Place, Cardiff, CF10 3AT United Kingdom.

The Journal of the Acoustical Society of America
|February 4, 2006
PubMed
Summary

Listeners combine binaural and monaural cues for speech recognition. Neither interaural correlation nor amplitude modulation alone is sufficient for understanding speech, highlighting the synergistic use of auditory information.

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Area of Science:

  • Auditory Neuroscience
  • Acoustic Signal Processing

Background:

  • The binaural spectrogram is a framework for analyzing auditory spatial cues.
  • Understanding how humans process complex auditory scenes, especially speech in noise, is crucial.

Purpose of the Study:

  • To investigate the relationship between binaural spectrogram cues and monaurally derived information for speech intelligibility.
  • To determine the sufficiency of individual auditory cues (interaural correlation, amplitude modulation) in supporting speech recognition.

Main Methods:

  • Two experiments used speech stimuli in noise (NoS pi configuration) with modulated monaural and binaural cues.
  • Resynthesized stimuli were created by altering intensity and interaural correlation.
  • Speech intelligibility and psychometric functions were measured.

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Main Results:

  • Individual cues (interaural correlation or amplitude modulation) yielded very low intelligibility, similar to monaural-only (NoSo) conditions.
  • Resynthesized stimuli combining cues showed reduced intelligibility compared to original binaural stimuli.
  • Modulation of interaural correlation alone resulted in a flat psychometric function, while combined cues showed similar slopes but horizontal shifts compared to original binaural stimuli.

Conclusions:

  • Neither interaural correlation nor monaural intensity fluctuations alone are sufficient for speech recognition at moderate signal-to-noise ratios.
  • Listeners synergistically combine monaural and binaural auditory information for speech processing, even within the same frequency regions.