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Chaos. 1995 Mar;5(1):30-34.

Nonlinear dynamics of the voice: Signal analysis and biomechanical modeling.

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Institute of Theoretical Physics, Technical University, Hardenbergstrasse 36, D-10623 Berlin, GermanyNational Center for Voice and Speech, The University of Iowa, Iowa City, Iowa 52242Institute of Theoretical Physics, Humboldt University, Invalidenstrasse 110, D-10115 Berlin, Germany.


Irregularities in voiced speech are often observed as a consequence of vocal fold lesions, paralyses, and other pathological conditions. Many of these instabilities are related to the intrinsic nonlinearities in the vibrations of the vocal folds. In this paper, bifurcations in voice signals are analyzed using narrow-band spectrograms. We study sustained phonation of patients with laryngeal paralysis and data from an excised larynx experiment. These spectrograms are compared with computer simulations of an asymmetric 2-mass model of the vocal folds.


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