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Related Experiment Videos

Perception of vocal tremor.

Jody Kreiman1, Brian Gabelman, Bruce R Gerratt

  • 1The David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1794, USA. jkreiman@ucla.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|March 22, 2003
PubMed
Summary

Vocal tremor

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Area of Science:

  • Speech Science
  • Acoustic Phonetics
  • Voice Pathology

Background:

  • Vocal tremors are common in pathological voices.
  • The acoustic-perceptual relationship of vocal tremor is not well understood.

Purpose of the Study:

  • To investigate the acoustic-perceptual aspects of vocal tremor.
  • To model vocal tremor using a custom voice synthesizer.

Main Methods:

  • Two tremor models (sinusoidal and irregular) were developed.
  • Synthetic voice samples were created and compared to natural pathological voice samples.
  • Listeners evaluated synthetic and natural stimuli in three perceptual experiments.

Main Results:

  • Both tremor models effectively matched subsets of pathological voices.
  • The importance of waveform shape increased with tremor severity.
  • Frequency deviation predicted perceived tremor amplitude.
  • Tremor rate differences were most discernible in sinusoidal, small-amplitude tremors.

Conclusions:

  • Difference limens for tremor rate and amplitude are larger for complex tremor patterns.
  • Tremor rate, regularity, and amplitude interact, influencing perceptual importance.

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