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Modulation detection interference under conditions favoring within- or across-channel processing

S P Bacon1, D L Konrad

  • 1Department of Speech and Hearing Science, Arizona State University, Tempe 85287-1908.

The Journal of the Acoustical Society of America
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Modulation detection interference (MDI) studies reveal that processing is similar across different masker frequencies, but within-channel effects may occur with lower masker frequencies. Results suggest spread of excitation influences MDI.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Modulation detection interference (MDI) is a phenomenon in auditory perception.
  • Understanding MDI helps elucidate auditory processing mechanisms, particularly across and within auditory channels.

Purpose of the Study:

  • To investigate MDI under conditions favoring across-channel versus within-channel processing.
  • To examine the influence of modulation frequency, masker-signal phase, masker modulation depth, and level on MDI.

Main Methods:

  • Experiments measured MDI using signal and masker tones at 2.0 kHz with masker carriers at 1.8 kHz or 4.0 kHz.
  • Varied modulation frequency (5–100 Hz), relative modulator phase, masker modulation depth, and signal/masker level.

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Main Results:

  • MDI decreased with increasing modulation frequency up to 20 Hz, then plateaued.
  • Relative phase had minimal consistent effect, though in-phase conditions showed MDI differences based on masker frequency.
  • Masker modulation depth influenced MDI proportionally.
  • MDI increased with level when signal and masker levels were equal; MDI was lower when the signal was more intense than the masker, particularly for the 1.8-kHz masker.

Conclusions:

  • Auditory processing for MDI is largely consistent across 1.8-kHz and 4.0-kHz masker carriers.
  • Within-channel processing, likely due to spread of excitation, influences MDI, especially with the 1.8-kHz masker.