AI Article Synopsis
- The main focus of the text is on how unsteady drag on vocal folds contributes to sound production in voiced speech, particularly due to vortex shedding.
- The paper uses a theoretical model to investigate the impact of the ventricular folds (or "false" vocal folds) on this drag and voice production.
- Findings suggest that the influence of the ventricular folds on acoustic output is minimal, even considering vocal fold movement and fluid-structure interactions; this is backed mathematically based on the timing of glottal jet velocity changes relative to vortex disturbances.
Article Abstract
The unsteady drag on the vocal folds is the major source of sound during voiced speech. The drag force is caused by vortex shedding from the vocal folds. The influence of the ventricular folds (i.e., the "false" vocal folds that protrude into the vocal tract a short distance downstream of the glottis) on the drag and the voice source are examined in this paper by means of a theoretical model involving vortex sheets in a two-dimensional geometry. The effect of the ventricular folds on the output acoustic pressure is found to be small when the movement of the vocal folds is prescribed. It is argued that the effect remains small when fluid-structure interactions account for vocal fold movement. These conclusions can be justified mathematically when the characteristic time scale for change in the velocity of the glottal jet is large compared to the time it takes for a vortex disturbance to be convicted through the vocal fold and ventricular fold region.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2856514 | PMC |
| http://dx.doi.org/10.1121/1.3299200 | DOI Listing |
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