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Interaction entre cordes vocales et bandes ventriculaires en phonation: exploration in-vivo, modélisation physique, validation in-vitro.

Abstract : The ventricular folds are two laryngeal structures, whose implication has been observed during specific vocal productions. The reason for the ventricular-folds involvement in the phonatory gesture and their effects on the laryngeal source are still barely explored and poorly understood.
This study aims to model the aerodynamic impact induced by the ventricular-folds on the glottal vibratory motion, by means of a theoretical description of the translaryngeal airflow combined to a physical model of phonation. The interaction between the vocal folds and the ventricular folds is characterized by both explorations on the human being (using synchronized electroglottography and high-speed cinematography) and on rigid and flexible in-vitro laryngeal replicas (using flow visualization, PIV measurement technique and pressure measurements).
The ventricular-folds behaviour is observed under different phonatory conditions (usual phonation, throat-singing, growls, vocal effort). They can remain static spaced out, move closer, make contact, vibrate periodically or not, in or out of phase with the vocal folds. The period-doubling phenomenon measured during throat-singing is specifically discussed. The periodic variation of glottal cycle duration is demonstrated. The impact of the ventricular geometry on the pressure distribution and the translaryngeal airflow resistance, on the frequency, the amplitude and the oscillation threshold pressures is measured in-vitro and compared to the theoretical outcomes. The presence of the ventricular constriction downstream to the vocal-folds replica can either alter or favour its self-vibratory motion, depending on the geometrical configuration.
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Submitted on : Monday, September 14, 2009 - 5:17:42 PM
Last modification on : Tuesday, October 19, 2021 - 11:22:18 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 8:20:52 PM

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  • HAL Id : tel-00416587, version 1

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Lucie Bailly. Interaction entre cordes vocales et bandes ventriculaires en phonation: exploration in-vivo, modélisation physique, validation in-vitro.. Acoustique [physics.class-ph]. Université du Maine, 2009. Français. ⟨tel-00416587⟩

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