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Related Experiment Videos

Masking of a brief probe by sinusoidal frequency modulation

B W Edwards1, N F Viemeister

  • 1Department of Psychology, University of Minnesota, Minneapolis 55455, USA.

The Journal of the Acoustical Society of America
|February 1, 1997
PubMed
Summary

Masking effects in hearing are not solely based on sound level. Frequency modulation (FM) masker thresholds increase with modulation index (beta), suggesting envelope shape discrimination plays a key role in auditory perception.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Signal Processing in Auditory System

Background:

  • Standard level detection models fail to explain masking phenomena with frequency modulation (FM).
  • Previous research indicated increasing thresholds with higher modulation index (beta) for FM maskers.

Purpose of the Study:

  • Investigate the underlying mechanisms of increased probe detection thresholds in the presence of FM maskers.
  • Determine whether frequency excursion or sweep rate is more critical in FM masking.
  • Explore the role of envelope shape discrimination in auditory masking.

Main Methods:

  • Experiment 1: Measured probe detection thresholds with varying FM masker modulation index (beta).
  • Experiment 2: Clipped masker instantaneous frequency to assess the impact of frequency excursion versus sweep rate.

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  • Experiment 3: Compared FM maskers to amplitude modulated (AM) maskers with similar envelopes.

    • Main Results:

    • Thresholds increased over 15 dB with increasing beta, confirming prior findings.
    • Clipped masker experiments showed detection depended on total frequency excursion, not sweep rate.
    • AM masker thresholds mimicked FM masker thresholds, despite reduced masker energy.

    Conclusions:

    • Auditory masking by FM signals is primarily driven by envelope shape discrimination.
    • Similarities in masker and masker-plus-probe envelopes within auditory filters explain observed masking patterns.
    • Findings challenge traditional level-detection models in psychoacoustics.