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Updated: Jan 20, 2026

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
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Intraglottal Aerodynamics at Vocal Fold Vibration Onset.

Philippe DeJonckere1, Jean Lebacq2

  • 1Federal Agency for Occupational Risks, Brussels, Belgium.

Journal of Voice : Official Journal of the Voice Foundation
|September 5, 2019
PubMed
Summary

Soft voice onset, the physiological start of speech, begins with airflow through a narrow glottis. Turbulence triggers vocal fold oscillations, initiating voice production.

Keywords:
BernoulliIntraglottal pressureReynolds numberTurbulenceVocal onset

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Area of Science:

  • Acoustic phonetics
  • Bioacoustics
  • Speech science

Background:

  • The soft onset is the most common physiological voice start in spontaneous speech.
  • It involves airflow through a narrow glottis, leading to initial vocal fold oscillations.
  • Understanding these transient events is key to analyzing voice production.

Purpose of the Study:

  • To analyze the intraglottal mechanical events during physiological soft voice onset.
  • To investigate the role of turbulence and pressure dynamics in initiating vocal fold oscillation.

Main Methods:

  • Combined in vivo measurements of airflow, glottal area, and pressure.
  • Analysis of transient mechanical events during soft onset.
  • Calculation of Reynolds number to identify turbulence onset.

Main Results:

  • The first vocal fold oscillation coincides with the appearance of turbulence (critical Reynolds number).
  • Turbulence acts as a trigger for the vocal fold and vocal tract oscillator.
  • Initial oscillations are sinusoidal, with balanced lung and Bernoulli pressures.

Conclusions:

  • Turbulence is identified as the trigger for physiological soft voice onset.
  • The mechanical properties of the vocal folds and vocal tract determine oscillation frequency.
  • The interplay of pressures and airflow dynamics governs the initiation of phonation.