341 声門直上呼気流速変動測定による声帯振動解析

概要

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The vibration of vocal folds results in the sound source for all voiced sounds in speech. This vibration is induced by the airflow that is expelled through glottis, and causes a series of the pulses of the airflow. These pulses excite vocal tract and bring about the passive resonance of the vocal tract in all voiced sounds. Therefore, detailed study of this airflow is believed to be important to elucidate mechanism of human phonation with the help of simultaneous observation of vocal fold movement, more specifically, glottal opening by means of high-speed digital camera. Thus in the present study experimental analysis of this airflow just above glottis was made to clarify phonation mechanism and seek better modeling of vocal folds, focusing on direct measurement of airflow velocity by means of a tiny hot-wire probe. The experimental results show that the periodic change of the airflow velocity occurs out of the phase of opening of glottis, though both have the same fundamental frequency. This fact is important since it gives a crucial hint for better simulation model of phonation mechanism.
社団法人日本機械学会の論文
2006-08-06