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Sensitivity to envelope coherence.

D M Green1, V M Richards, Z A Onsan

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

The Journal of the Acoustical Society of America
|January 1, 1990
PubMed
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This study investigated auditory perception, specifically the ability to detect phase differences in amplitude-modulated sounds. Performance improved with higher sound levels but decreased at faster modulation rates.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Understanding auditory perception is crucial for developing better hearing technologies.
  • The ability to discriminate phase relationships in modulated sounds is fundamental to auditory processing.

Purpose of the Study:

  • To investigate the influence of carrier level, frequency, and modulation rate on the discrimination of phase relationships between two amplitude-modulated sinusoids.
  • To compare these findings with data from comodulation masking release experiments.

Main Methods:

  • Observers discriminated the phase relationship (in-phase or out-of-phase) of two amplitude-modulated sinusoids.
  • Carrier spacing was 2/3 or 4/3 octave.
  • Modulation depth was varied to determine thresholds.

Related Experiment Videos

  • Carrier levels, frequency loci, and modulation rates were systematically manipulated.

    • Main Results:

    • Discrimination performance improved with increasing carrier levels up to approximately 60 dB SPL.
    • The frequency locus (500–8000 Hz) had minimal impact on discrimination accuracy.
    • Performance remained stable for modulation rates below 100 Hz, deteriorating thereafter.

    Conclusions:

    • Auditory phase discrimination is influenced by sound intensity and modulation rate.
    • These findings provide insights into the mechanisms of auditory envelope processing.
    • Comparison with comodulation masking release data may elucidate shared processing pathways.