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Some effects of background noise on modulation detection interference.

S P Bacon1

  • 1Department of Speech and Hearing Science, Arizona State University, Tempe 85287-1908, USA. spb@asu.edu

Hearing Research
|April 6, 1999
PubMed
Summary
This summary is machine-generated.

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The proximity effect, where masker frequency influences signal interference, diminishes as masker frequency moves away from the signal. Background noise impacts this effect differently depending on masker modulation.

Area of Science:

  • Auditory perception
  • Psychoacoustics

Background:

  • Masker interference is a key factor in auditory perception.
  • Understanding the proximity effect is crucial for auditory modeling.

Purpose of the Study:

  • To investigate the influence of masker frequency proximity on signal modulation detection.
  • To determine the role of background noise in the proximity effect.
  • To explore the underlying mechanisms (peripheral vs. central) of the proximity effect.

Main Methods:

  • Modulation detection thresholds were measured for a 2000-Hz signal.
  • Maskers varied in frequency, modulation (unmodulated or 10 Hz), and presence of broadband or narrowband noise.
  • Excitation pattern analysis was employed.

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Main Results:

  • A proximity effect was observed, particularly for higher masker frequencies, where interference decreased with increasing frequency separation.
  • Broadband noise eliminated the proximity effect for unmodulated maskers but not for modulated maskers.
  • Narrowband noise results suggested broadband noise affects the high-frequency side of the auditory system's excitation pattern.

Conclusions:

  • The proximity effect for unmodulated maskers may involve peripheral, within-channel interactions.
  • The proximity effect for modulated maskers likely involves central, across-channel interactions.
  • Auditory processing of masker proximity is influenced by both frequency separation and background noise characteristics.