| Project/Area Number |
59440071
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Otorhinolaryngology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
1984 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥16,000,000 (Direct Cost: ¥16,000,000)
Fiscal Year 1985: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1984: ¥14,000,000 (Direct Cost: ¥14,000,000)
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| Keywords | non-invasive analysis / ultrasonic method / solid-state image sensor / tongue / larynx / image processing / 発音 |
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| Research Abstract |
1. Analysis of articulatory dynamics at the vocal tract level The result of an automatic identification of the position of the mandible indicated that the Japanese vowels could be divided into two groups depending on the degree of jaw opening. For analyzing tongue movements, the ultrasonic observation method was employed. The ultrasonic probe was held under the subject's submandibular triangle to observe the sagittal configuration of the tongue dorsum. Also, tongue dynamics along two selected axes parpendicular to the tongue dorsum were detected. It was found that there was a good correspondence between the acoustic time course of vowel formants and tongue dynamics. Abnormal articulatory dynamics of cerebellar ataxia were best represented as an inconsistency of articulatory movements in terms of displacement and velocity both of which were quantified by the present analysis system. The articulatory pattern of amyotrophic lateral sclerosis was characterized by the decrease in the range and velocity of movements. The system proved effective for articulatory training.
2. Analysis of laryngeal dynamics Stereoscopic analysis revealed that the vocal fold was elongated during inspiration. For analyzing vibratory patterns of the vocal folds, a digital recording system using solid-state image sensor attached to a conventional scope was used. It was found that there was a difference in acoustic characteristic as well as temporal course of the displacement of the vocal fold margin between the closed and open phases of the vibration. In the case of breathy hoarseness, incomplete glottis closure associated with the decrease in high frequency acoustic energy was revealed. The system proved useful for clinical analysis of vocal pathology.
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