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Fringe effects in modulation masking.

S P Bacon1, D W Grantham

  • 1Department of Speech and Hearing Science, Arizona State University, Tempe 85287-0102.

The Journal of the Acoustical Society of America
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

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Adding a brief masker "fringe" before and after a signal can improve modulation detection, especially at lower frequencies. This auditory processing enhancement depends on fringe duration and depth.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Auditory perception relies on detecting changes in sound amplitude.
  • Modulation detection thresholds quantify the ability to perceive these amplitude changes.

Purpose of the Study:

  • To investigate the effect of masker temporal characteristics on modulation detection.
  • To determine the optimal duration and depth of a masker fringe for improving detection.

Main Methods:

  • Measured modulation detection thresholds for sinusoidally amplitude-modulated (SAM) noise signals.
  • Utilized a SAM noise masker with varying fringe durations (62.5 ms to continuous) and depths.
  • Presented signals and maskers continuously, with signal modulation in one of two observation intervals.

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Main Results:

  • A 500-ms masker fringe reduced thresholds by 4-6 dB at low signal modulation frequencies (2-8 Hz).
  • Optimal fringe effectiveness required a 500-ms duration and a depth of approximately 0.75.
  • The pre-observation interval fringe contributed to, but was not solely responsible for, the observed effect.

Conclusions:

  • Temporal masker characteristics, specifically fringe duration and depth, significantly influence modulation detection.
  • Results suggest contributions from both peripheral and central auditory processing mechanisms.
  • The findings have implications for understanding auditory scene analysis and masker effects.