Computer simulation of pathological vocal-cord vibration

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Abstract
A dynamic model of the [human] vocal cords, namely, a bilaterally symmetric 2-mass model, was extended to a bilaterally asymmetric 2-mass model to simulate pathological conditions of the vocal cords. Asymmetric behavior of the computer model was investigated for various conditions of imbalance in bilateral tension. The computer model behaved in 3 basic vibratory modes that were similar to those observed in physiological experiments on larynges under tension imbalance. The 3 distinctive modes were a vibratory pattern with differences in phase and amplitude of cord vibration; a nearly periodic motion without glottal closure; and an unsteady, dicrotic or tricrotic motion. The 3 modes were a strong function of the subglottal pressure and the glottal rest area and the imbalance conditions of the cord parameters. The asymmetric vocal-cord model was incorporated into a dynamic vocal-tract synthesizer to simulate speech with a hoarse voice.

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