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Temporal gaps in noise and sinusoids.

D M Green1, T G Forrest

  • 1Department of Psychology, University of Florida, Gainesville 32611.

The Journal of the Acoustical Society of America
|September 1, 1989
PubMed
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Human ability to detect auditory gaps depends on noise levels and signal characteristics. Higher frequencies and broader bandwidths improve gap detection, while temporal uncertainty hinders it.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Understanding auditory gap detection is crucial for speech intelligibility and music perception.
  • Previous research has explored factors influencing gap detection, but comprehensive analysis across various stimuli is needed.

Purpose of the Study:

  • To systematically investigate human observers' ability to detect partially filled and completely silent auditory gaps.
  • To determine how different acoustic parameters, including noise characteristics, signal bandwidth, center frequency, and temporal uncertainty, affect gap detection thresholds.

Main Methods:

  • Utilized psychophysical methods to measure gap detection thresholds across various waveforms, including broadband noise, narrow-band noise, and complex tones.
  • Manipulated parameters such as noise level during the gap, signal-to-noise ratio, signal bandwidth, center frequency, and temporal uncertainty.

Related Experiment Videos

Main Results:

  • Gap detection in broadband noise was influenced by the amount of residual noise during the gap.
  • Detection performance varied with signal-to-noise ratio in narrow-band noise.
  • Increased signal bandwidth and higher center frequencies generally improved gap detection.
  • Temporal uncertainty regarding the gap's position significantly degraded detection performance across all tested conditions.

Conclusions:

  • Auditory gap detection is a complex process influenced by spectral and temporal acoustic features.
  • Signal characteristics like bandwidth and frequency, along with noise properties, play significant roles.
  • Temporal uncertainty is a critical factor that impairs the ability to detect brief auditory events.