Third International Conference on Spoken Language Processing (ICSLP 94) Yokohama, Japan September 18-22, 1994

Chaotic Characteristics of Voice Fluctuation and its Model Explanation: Normal and Pathological Voices

Yuki Kakita, Hitoshi Okamoto

Dept. of Electronics, Kanazawa Institute of Technology, 7-1, Kanazawa-Minami, Japan

This paper reports on an analysis of vocal irregularity in pitch and amplitude in terms of (1) the "pseudo-phase-portrait," (2) the "fractal dimension" of the fluctuation, and (3) a model generating the fluctuation. A simple mathematical model generating the time series of fluctuation is proposed. Using this model, varying aspects of fluctuations as well as of the pseudo-phase-portraits are successfully described with a single control parameter. We also report that, by the simulation based on the model, a resultant intermittent type of fluctuation can manifest the chaotic behavior.

Full Paper

Bibliographic reference.  Kakita, Yuki / Okamoto, Hitoshi (1994): "Chaotic characteristics of voice fluctuation and its model explanation: normal and pathological voices", In ICSLP-1994, 639-642.