1996 Fiscal Year Final Research Report Summary
Analyzes of Nonlinear Vocal Variability and Controllability of Neural Voice Disorders
| Project/Area Number |
07832006
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 時限 |
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| Research Field |
非線形科学
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| Research Institution | University of Tokyo |
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Principal Investigator |
IMAIZUMI Satoshi University of Tokyo, Faculty of Medicine, Associate Professor, 医学部, 助教授 (80122018)
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| Co-Investigator(Kenkyū-buntansha) |
NIIMI Seiji University of Tokyo, Faculty of Medicine, Professor, 医学部, 教授 (00010273)
KIRITANI Shigeru University of Tokyo, Faculty of Medicine, Professor, 医学部, 教授 (90010032)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Voice disorder / Neural voice disorders / SPD / Vocal variability / Voice contrallability / Acoustic analysis / Fractal dimension / Nonlinearlity |
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| Research Abstract |
The variability and controllability of vocal fundamental frequency (F0) are investigated by analyzing the acoustic and perceptual characteristics of sustained vowel samples recorded from patients with spasmodic dysphonia (SPD) as well as patients with various types of laryngeal disorders and normal controls. All the pathological groups show larger variations in F0 or lower controllability than the normal controls. The voice segments perceptually judged as non-sporadic show significantly larger variations in F0 than the normal controls. From the voice segments perceptually judged as sporadic, instantaneous changes in F0 or in amplitude, chaotic changes in voice waveform such as bifurcations are observed. Based on the obtained results, a model of normal and disordered voice control mechanism is proposed, in which morphological and neural abnormalities affect voice variability. The acoustic analysis method described here is found beneficial in analyzing voice variability and controllability, and can provide useful information to know normal and disordered voice control mechanisms.
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