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Related Experiment Videos

Irregular vocal-fold vibration--high-speed observation and modeling.

P Mergell1, H Herzel, I R Titze

  • 1Siemens Audiologische Technik GmbH, Erlangen, Germany. mergell@med.siemens.de

The Journal of the Acoustical Society of America
|January 6, 2001
PubMed
Summary

This study visualizes asymmetric vocal fold oscillations, revealing complex dynamics and transitions in vocal fold vibrations. A two-mass larynx model accurately reproduces these observed nonstationary asymmetric vocal fold dynamics.

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Area of Science:

  • * Biomechanics of the larynx
  • * Vocal fold dynamics and acoustics
  • * Nonlinear systems analysis

Background:

  • * Understanding vocal fold oscillations is crucial for voice production.
  • * Nonstationary and asymmetric vibrations present complex dynamics.
  • * Previous models often simplify laryngeal asymmetry.

Observation:

  • * Direct high-speed imaging captured nonstationary asymmetric vocal fold oscillations.
  • * Complex time series data were extracted for left and right vocal folds.
  • * High-speed glottograms showed transitions between subharmonic and quasiperiodic oscillations.

Findings:

  • * Vocal fold vibration dynamics exhibit transitions between low-dimensional attractors.
  • * Spectral components are linear combinations of two fundamental frequencies, with their ratio indicating laryngeal asymmetry.

Related Experiment Videos

  • * A simplified asymmetric two-mass larynx model, parameterized by experimental data, accurately reproduced observed time series and amplitude contours, including phase-locked rhythms (4:5 to 2:3).

    • Implications:

    • * Provides a validated model for studying voice disorders related to laryngeal asymmetry.
    • * Enhances understanding of the complex biomechanics underlying voice production.
    • * Offers insights into the control mechanisms of vocal fold vibrations.