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Modulation discrimination interference for narrow-band noise modulators

B C Moore1, A Sek, M J Shailer

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

The Journal of the Acoustical Society of America
|April 1, 1995
PubMed
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Modulation discrimination interference (MDI) occurs when maskers disrupt signal depth perception. This study found that the moment-by-moment envelope similarity between signal and masker plays a minor role in MDI, though modulation rate similarity has some influence.

Area of Science:

  • Auditory perception
  • Signal processing
  • Psychoacoustics

Background:

  • Amplitude modulation depth discrimination is crucial for auditory perception.
  • Modulation Discrimination Interference (MDI) occurs when maskers disrupt this discrimination.
  • The influence of masker envelope pattern similarity on MDI is not well understood.

Purpose of the Study:

  • To investigate the role of envelope pattern similarity between signal and masker in Modulation Discrimination Interference (MDI).
  • To determine if masker modulation characteristics affect the degree of MDI.
  • To explore the relationship between modulation rate similarity and MDI.

Main Methods:

  • Experiment 1: Used narrow-band noise (10 Hz) as signal and masker modulators with varying correlations (identical, negative, uncorrelated).

Related Experiment Videos

  • Experiment 2: Used sinusoidal maskers with modulation rates from 2 to 64 Hz.
  • Measured the amount of MDI under different masker conditions.

    • Main Results:

    • MDI levels were similar across different correlation conditions of noise modulators.
    • Masker similarity in envelope pattern played a minor role in MDI.
    • Sinusoidally modulated maskers produced MDI comparable to noise modulators when root-mean-square modulation depths were equated.
    • Broad tuning for modulation rate was observed, similar to signal modulation.

    Conclusions:

    • The moment-by-moment envelope pattern similarity between signal and masker is not a primary factor in Modulation Discrimination Interference (MDI).
    • Modulation rate similarity does exert some influence on MDI.
    • Auditory system's processing of amplitude modulation is robust to masker envelope pattern variations but sensitive to rate similarity.