Abstract
The adjustment of the larynx and articulation in the vocal tract for the utterance of Japanese words were investigated by means of a digital simulation of anatomical structure models. In order to control the contraction of each muscle involved in the models, neuromotor commands were generated by rules from phonemic input. The rules were obtained by the analysis of electromyographic data. The resulting movements of the larynx and the vocal tract were compared with observed data regarding the vertical displacement of the larynx, mouth shape, jaw opening, and lingual contact to the palate. Next, glottal sound was generated by a functional model combined with the model of the larynx, and a speech sound was derived by simulating the propagation of the glottal sound through the model of the vocal tract. The correspondence of the changes in the fundamental frequency and in the formant frequencies of the synthetic speech to those observed in natural speech was also discussed. [Work Supported by Ministry of Education, Japan.]
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