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Journal of Speech and Hearing Research Vol.37 1008-1019 October 1994.
© American Speech-Language-Hearing Association
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Analysis of Vocal Disorders With Methods From Nonlinear Dynamics

Hanspeter Herzel 1
David Berry 2
Ingo R. Titze 2

Marwa Saleh 3
1 Technical University Berlin, Germany
2 Department of Speech Pathology and Audiology National Center for Voice and Speech The University of Iowa Iowa City
3 Ain Shams University, Egypt

ingo-titze{at}uiowa.edu

Several authors have recently demonstrated the intimate relationship between nonlinear dynamics and observations in vocal fold vibration (Herzel, 1993; Mende, Herzel, & Wermke, 1990; Titze, Baken, & Herzel, 1993). The aim of this paper is to analyze vocal disorders from a nonlinear dynamics point of view. Basic concepts and analysis techniques from nonlinear dynamics are reviewed and related to voice. The voices of several patients with vocal disorders are analyzed using traditional voice analysis techniques and methods from nonlinear dynamics. The two methods are shown to complement each other in many ways. Likely physiological mechanisms of the observed nonlinear phenomena are presented, and it is shown how much of the terminology in the literature describing rough voice can be unified within the framework of nonlinear dynamics.

KEY WORDS: vocal disorders, nonlinear dynamics, voice analysis, bifurcations

Submitted on October 25, 1992
Accepted on March 30, 1994






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