Abstract
Research has continued on the model of the larynx described at a previous meeting of the society. [T. H. Crystal, “Model of Larynx Activity during Phonation,” J. Acoust. Soc. Am. 33, 93(A) (1965)]. The model has been adjusted to exhibit the same trends in subglottal pressure, average flow rate, and vocal intensity measured by Isshiki in experiments on human subjects [N. Isshiki, “Regulatory Mechanism of Voice Intensity Variation,” J. Speech Hearing Res. 7, 17–29 (1964).] This is achieved by adjusting spring tension and rest position of the simple-harmonic oscillator that is used to model the mechanical facets of vocal-fold activity. Additional data have been gathered on the loading effect of simple vocal-tract models on the operation of the larynx model. The model also has been used to demonstrate the waveform changes that might be expected when a talker breathes helium-rich air. [Work supported in part by the National Institutes of Health, U. S. Department of Health. Education, and Welfare, by the U. S. Air Force Cambridge Research Laboratories, Office of Aerospace Research, by Project MAC, an MIT research program sponsored by the U. S. Department of Defense.]
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