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Related Experiment Videos

Discrimination of nonlinear frequency glides.

Nick Thyer1, Doug Mahar

  • 1School of Healthcare, University of Leeds, United Kingdom.

The Journal of the Acoustical Society of America
|May 20, 2006
PubMed
Summary

Auditory perception of nonlinear tone glides was tested. Results indicate that the rate of frequency change alone can be sufficient for discriminating these sounds, especially when duration and frequency are constant.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Nonlinear tone glides are complex auditory signals.
  • Understanding their perception is crucial for auditory modeling.

Purpose of the Study:

  • To determine if glide rate alone is sufficient for discrimination of nonlinear tone glides.
  • To measure discrimination thresholds across varying glide rates and durations.

Main Methods:

  • Measured discrimination thresholds for rising and falling nonlinear glides.
  • Varied glide duration (50 ms, 400 ms), frequency excursions (0.5, 1, 2 ERBs), and center frequencies (0.5, 2.0, 6.0 kHz).

Main Results:

  • Discrimination was possible even with identical duration and endpoint frequencies.
  • Thresholds differed significantly from linear glide studies.
  • Higher transition spans, especially above 1 ERB, led to increased thresholds.
  • A Weber fraction of 0.6-0.7 was observed.

Conclusions:

  • An excitation pattern model may explain nonlinear glide detection.
  • This model struggles with rapid frequency changes exceeding auditory filter widths and short durations.

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