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Related Experiment Videos

Modulation detection interference using random and sinusoidal amplitude modulation

L Mendoza1, J W Hall, J H Grose

  • 1Division of Otolaryngology/Head and Neck Surgery, University of North Carolina Medical School, Chapel Hill 27599-7070, USA.

The Journal of the Acoustical Society of America
|April 1, 1995
PubMed
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Modulation detection interference (MDI) makes it harder to detect amplitude modulation (AM) in target sounds. Interference was greater for random amplitude modulations (RAM) than sinusoidal AM (SAM) stimuli, suggesting AM discrimination underlies MDI.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Auditory perception involves detecting amplitude modulation (AM) in sounds.
  • Modulation detection interference (MDI) occurs when a modulated sound interferes with target sound AM detection.
  • The characteristics of MDI for different modulation types are not fully understood.

Purpose of the Study:

  • To investigate modulation detection interference (MDI).
  • To compare MDI for random amplitude modulations (RAM) and sinusoidal amplitude modulations (SAM).
  • To explore the role of modulation depth and coherence in MDI.

Main Methods:

  • Participants detected amplitude modulation (AM) of target sounds in the presence of interferers.
  • Stimuli included random amplitude modulations (RAM) and sinusoidal amplitude modulations (SAM).

Related Experiment Videos

  • Modulation depth and coherence of target and interferer were varied.

    • Main Results:

    • Modulation detection interference (MDI) increased with interferer modulation depth for both RAM and SAM.
    • MDI was greater for RAM stimuli compared to SAM stimuli.
    • Modulation coherence did not significantly affect the amount of interference.

    Conclusions:

    • The results suggest that amplitude modulation (AM) discrimination underlies modulation detection interference (MDI).
    • Random amplitude modulations (RAM) present greater interference than sinusoidal amplitude modulations (SAM).
    • MDI mechanisms are consistent with AM discrimination when target and interferer are synchronously gated.