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Related Experiment Videos

Reconciling frequency selectivity and phase effects in masking.

A J Oxenham1, T Dau

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139, USA. oxenham@mit.edu

The Journal of the Acoustical Society of America
|September 27, 2001
PubMed
Summary
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Auditory masking effects depend on masker phase, not just frequency selectivity. A single-channel model explains these phase effects, aligning with frequency selectivity measures.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Auditory masking studies investigate how masker sounds impede signal detection.
  • Frequency selectivity and phase response are key factors influencing auditory masking.
  • Harmonic tone complexes with specific phase properties (Schroeder-phase) are used to probe auditory processing.

Purpose of the Study:

  • To investigate the influence of auditory frequency selectivity and phase response on masking.
  • To determine if masker phase effects can be explained by a single-channel auditory model.
  • To reconcile findings on broadband processing with measures of frequency selectivity.

Main Methods:

  • Measured signal detection thresholds using Schroeder-phase harmonic tone complex maskers.

Related Experiment Videos

  • Assessed frequency selectivity using notched-noise methods and a novel measurement technique.
  • Modeled auditory filter responses using Gammatone and Gammachirp filters within a single-channel framework.

    • Main Results:

    • Significant masker phase effects on thresholds were observed when masker bandwidth exceeded the critical band.
    • Frequency selectivity was independent of masker type (complex tones vs. noise).
    • The Gammachirp filter, with adjusted phase response, best modeled both frequency selectivity and phase effects.

    Conclusions:

    • Masker phase effects in auditory masking can be explained by a single-channel model.
    • These findings are consistent with measured frequency selectivity.
    • Apparent broadband processing in masking does not necessitate across-channel mechanisms.