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Experimental study on nonlinear source-filter interaction using synthetic vocal fold models.

Kishin Migimatsu1, Isao T Tokuda1

  • 1Graduate School of Science and Engineering, Ritsumeikan University, Noji-higashi, Kusatsu, Shiga 525-8577, Japan.

The Journal of the Acoustical Society of America
|September 2, 2019
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Summary
This summary is machine-generated.

Vocal fold vibration can interact with vocal tract acoustics, especially in singing. This study shows how vocal fold asymmetry and frequency crossings increase phonation threshold pressure, with interaction strength varying by model.

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Area of Science:

  • Acoustics
  • Bioengineering
  • Voice Science

Background:

  • Vocal fold fundamental frequency can interfere with vocal tract formant frequencies under specific conditions, like singing.
  • This interference leads to significant acoustic feedback from the vocal tract filter to the vocal fold source.

Purpose of the Study:

  • To experimentally investigate source-filter interaction in synthetic vocal fold models.
  • To explore the effects of vocal fold asymmetry and frequency crossings on phonation.
  • To analyze the variability of source-filter interaction strength across different vocal fold models.

Main Methods:

  • Utilized three types of synthetic vocal fold models.
  • Introduced asymmetry between left and right vocal folds.
  • Observed nonlinear phenomena and measured phonation threshold pressure.

Main Results:

  • Reproduced nonlinear phenomena like frequency jump and quenching.
  • Observed increased phonation threshold pressure when vocal tract resonant frequency and vocal fold fundamental frequency crossed.
  • Found that left-right vocal fold asymmetry further elevated phonation threshold pressure.
  • Noted variable strength of source-filter interaction across different model types.

Conclusions:

  • Source-filter interaction is a significant factor in voice production, particularly under conditions of frequency overlap and vocal fold asymmetry.
  • Vocal fold asymmetry can exacerbate the increase in phonation threshold pressure.
  • The degree of vocal tract influence on vocal fold vibration varies, suggesting individual differences in humans.