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Biophysics of Voice Onset: A Comprehensive Overview.

Philippe H DeJonckere1, Jean Lebacq2

  • 1Federal Agency for Occupational Risks, 1210 Brussels, Belgium.

Bioengineering (Basel, Switzerland)
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

Voice onset involves vocal fold movement and stable vibration. This study analyzes physiological measurements of voice onset biomechanics, revealing key aerodynamic conditions for vocal fold oscillation.

Keywords:
coup de glotteglottal attackhard onsetintraglottal pressuresoft onsetturbulencevocal onset

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Area of Science:

  • Biomechanics of phonation
  • Vocal fold dynamics
  • Aerodynamics of voice production

Background:

  • Voice onset is a critical transient phase in phonation, bridging initial vocal fold movement to stable vibration.
  • Understanding voice onset biomechanics is crucial for analyzing normal and pathological vocal emissions.
  • Previous studies lacked a unified methodology for comprehensive analysis of this phenomenon.

Purpose of the Study:

  • To provide a comprehensive biomechanical survey of voice onset in normal modal vocalization.
  • To analyze the transient phenomenon using a consistent, in vivo physiological measurement methodology.
  • To elucidate the aerodynamic and pressure dynamics triggering vocal fold oscillation during onset.

Main Methods:

  • Utilized a common methodology combining high-speed imaging, sound analysis, and multiple glottography techniques (electro-, photo-, flow-, ultrasound).
  • Measured instantaneous glottal area and airflow.
  • Calculated instantaneous intraglottal pressure to provide detailed qualitative and quantitative insights into the onset phenomenon.

Main Results:

  • Intraglottal pressure leads the glottal opening signal from initial cycles, essential for energy transfer to vocal fold tissue.
  • This phase lead is attributed to air compressibility and vocal tract inertance, causing airflow curve skewing.
  • Soft, physiological onsets exhibit a spindle-shaped glottis before oscillation, with oscillations occurring around a paramedian axis.

Conclusions:

  • The study explains the oscillation triggering mechanism through intraglottal aerodynamic conditions and pressure-area relationships.
  • Findings link voice onset biomechanics to sustained phonation and comparable phenomena in wind instruments and singing.
  • This research offers new insights into the fundamental physics of voice production and sound generation.