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Related Experiment Videos

Modulation detection interference: effects of concurrent and sequential streaming.

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
|August 18, 2001
PubMed
Summary
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Modulation detection interference (MDI) occurs when amplitude fluctuations in one frequency mask those in another. Asynchronous gating and precursor tones can reduce or eliminate MDI by perceptually segregating sounds.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Modulation detection interference (MDI) impairs detecting amplitude fluctuations across different frequency regions.
  • Asynchronous gating of sounds can reduce MDI by promoting perceptual segregation.

Purpose of the Study:

  • To investigate the role of carrier and modulator gating asynchrony in reducing MDI.
  • To examine the effectiveness of precursor tones in eliminating MDI by enhancing perceptual isolation.

Main Methods:

  • Experiment 1: Varied onset/offset asynchrony between target and masker carriers and modulators.
  • Experiment 2: Introduced precursor tones to facilitate masker-target perceptual stream formation.

Main Results:

Related Experiment Videos

  • Extending masker carrier duration reduced MDI, irrespective of modulator synchrony.
  • Asynchronous modulator gating did not release MDI when carriers were synchronous.
  • Precursor tones at the masker frequency completely eliminated MDI.

Conclusions:

  • MDI arises from perceptual grouping of masker and target sounds.
  • Perceptual segregation of masker and target is key to reducing or eliminating MDI.