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Related Experiment Videos

Across-channel masking and comodulation masking release.

B C Moore1, B R Glasberg, G P Schooneveldt

  • 1Department of Experimental Psychology, University of Cambridge, England.

The Journal of the Acoustical Society of America
|April 1, 1990
PubMed
Summary

This study explored auditory masking, specifically comodulation masking release (CMR) and across-channel masking (ACM). Results show CMR occurs only when signals are in masker envelope dips, indicating significant ACM effects.

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Area of Science:

  • Psychoacoustics
  • Auditory perception
  • Signal processing in hearing

Background:

  • Auditory masking is crucial for understanding speech and sound perception.
  • Comodulation masking release (CMR) and across-channel masking (ACM) are key phenomena in auditory masking.
  • Previous work by Grose and Hall (1989) established foundational understanding of CMR.

Purpose of the Study:

  • To extend research on CMR by investigating the influence of temporal signal position within masker modulation cycles.
  • To differentiate between CMR and ACM effects under various masking conditions.
  • To examine the role of within-channel masking by manipulating masker components.

Main Methods:

  • Experiments used a 700-Hz signal and a masker composed of harmonic tones (3rd to 11th) of a 100-Hz fundamental.

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  • Masker components were either sinusoidally amplitude modulated (SAM) with identical phase (comodulated) or with phase shifts (phase-incoherent).
  • Signal presentation varied: at masker envelope dips, peaks, or modified peaks/dips, with different modulation depths and phases.

    • Main Results:

    • Comodulated maskers yielded lower detection thresholds (CMR) than reference maskers when signals were in envelope dips.
    • Phase-incoherent maskers sometimes yielded higher thresholds, but CMR was not consistently observed.
    • No CMR was found when signals were presented at envelope peaks; performance degraded in both comodulated and phase-incoherent conditions, suggesting strong ACM.
    • Removing flanking masker components did not alter results, confirming robustness of findings.

    Conclusions:

    • CMR is highly dependent on the signal's temporal position within the masker's envelope, specifically in dips.
    • Across-channel masking (ACM) effects significantly influence auditory masking, often dominating when signals are not in envelope dips.
    • Findings highlight the complex interplay between within-channel and across-channel processes in auditory perception.