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Related Experiment Videos

Phase effects in masking: within- versus across-channel processes.

José I Alcántara1, Brian C J Moore, Brian R Glasberg

  • 1Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, England. jia10@cus.cam.ac.uk

The Journal of the Acoustical Society of America
|November 1, 2003
PubMed
Summary

Wider bandwidths and cosine-phase (CP) maskers significantly improve hearing thresholds compared to random-phase (RP) maskers. These findings suggest auditory processing relies on internal filter and temporal integration, not just across-channel comparisons.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing in hearing

Background:

  • Masking effects in hearing are influenced by masker properties like bandwidth and phase.
  • Understanding these effects is crucial for developing hearing aids and auditory models.

Purpose of the Study:

  • To investigate the impact of bandwidth and component phase on auditory masking.
  • To determine the role of across-channel comparisons versus internal auditory system modeling in explaining masking effects.

Main Methods:

  • Used narrowband (1-ERB(N)) and broadband (5-ERB(N)) cosine-phase (CP) and random-phase (RP) harmonic complex maskers.
  • Measured masked thresholds for sinusoidal signals at 1 and 6 kHz under various masker conditions, including monaural and contralateral presentation.
  • Employed a notched-noise masker to limit off-frequency listening.

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Main Results:

  • Thresholds were lower for CP maskers than RP maskers, with a greater effect for wider bandwidths.
  • Broader bandwidths (5-ERB(N)) significantly lowered thresholds for CP maskers compared to narrower bandwidths (1-ERB(N)).
  • Contralateral presentation of masker components increased thresholds, indicating monaural broadband effects are not solely due to across-channel comparisons.

Conclusions:

  • Auditory masking is significantly affected by masker bandwidth and phase.
  • A model incorporating a simulated auditory filter, nonlinearity, and temporal integration accurately predicts masked thresholds.
  • Across-channel processes and selective listening are not necessary to explain the observed masking phenomena.