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Monaural envelope correlation perception.

V M Richards1

  • 1Department of Psychology, University of Florida, Gainesville 32611.

The Journal of the Acoustical Society of America
|November 1, 1987
PubMed
Summary
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Listeners can distinguish between noise bands with different envelopes, especially at higher frequencies. Discrimination performance varies with frequency separation and envelope correlation, but detectability changes consistently on a specific scale.

Area of Science:

  • Psychoacoustics
  • Auditory perception
  • Signal processing

Background:

  • Auditory systems process complex acoustic information.
  • Discriminating between auditory signals is crucial for communication.
  • Envelope characteristics of noise bands influence auditory perception.

Purpose of the Study:

  • To measure the ability to discriminate between noise bands with similar or dissimilar envelopes.
  • To investigate the effect of center frequency and frequency separation on this discrimination.
  • To examine how envelope correlation impacts the discrimination of noise bands.

Main Methods:

  • Simultaneously presented 100-Hz-wide noise bands with varying center frequencies (fL) and separations (delta f).
  • Systematic variation of frequency separations relative to octave intervals (delta f = fL vs. delta f < fL).

Related Experiment Videos

  • Discrimination tasks involving noise bands with different envelope correlations (similar, dissimilar, perfectly correlated, partially correlated, uncorrelated).

    • Main Results:

    • Discrimination was at chance levels for octave frequency separations.
    • Best discrimination occurred for center frequencies of 2500 and 4000 Hz with separations less than an octave.
    • Performance decreased for lower center frequencies (1000 Hz) and was impossible at 350 Hz.
    • Detectability changes were consistent on an equal-variance scale (Fisher's z) regardless of envelope correlation.

    Conclusions:

    • Auditory discrimination of noise band envelopes is frequency-dependent.
    • Higher center frequencies facilitate better discrimination of envelope differences.
    • A consistent relationship exists between changes in detectability and the Fisher's z scale, irrespective of envelope correlation.