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International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 1999)Florence, Italy |
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International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 1999)Florence, Italy |
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From the point of view of physical modelling,
phonation is the result of a complex
interaction between the airflow through the
glottis and the mechanical reaction of the
vocal folds. During "normal" phonation, one
can reasonably assume that both vocal folds
are oscillating in phase and thus that glottis
forms a symmetrical channel for the airflow.
A number of voice pathologies, such as
unilateral laryngeal paralyses, or involving
tumours or lesions, are however clearly
causing an asymmetrical motion of the vocal
folds. All existing studies about such
pathologies are focussing on the
asymmetrical mechanical aspect of the
problem whereas the possible effects of this
asymmetry on the flow is completely
overlooked.
In an attempt to evaluate the relevance of
such an assumption, we present in this paper a
systematic study of the symmetry of the flow
through symmetrical and asymmetrical
replicas of the vocal folds.
Bibliographic reference. Vilain, Coriandre / Pelorson, Xavier / Thomas, Dorothée (1999): "Effects of an induced asymmetry on the flow through the glottis in relation to voice pathology", In MAVEBA-1999, 70-73.