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1st ETRW on Speech Production Modeling:
From Control Strategies to Acoustics
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1st ETRW on Speech Production Modeling:
From Control Strategies to Acoustics
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The nonlinear dynamics of the vocal fold oscillation at phonation is studied on low dimensional mathematical models. First, a bifurcation diagram is derived for the two-mass model Two equilibrium positions for the vocal folds and associated bifurcation phenomena are found, and a relation with the existence of vocal registers is discussed. It is shown that the results contest a previous oscillation theory derived from a collapsible tube analogy. Next, the phonation threshold pressure is examined on a mucosal wave model. The existence of a hysteresis effect for phonation onset and offset is shown, in agreement with previous experimental results.
Bibliographic reference. Lucero, Jorge C. (1996): "Nonlinear dynamics of the vocal fold oscillation", In SPM-1996, 185-188.