Elucidation of human phonation mechanisms based on airflow in a larynx induced by vocal fold vibration

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Acoustics of human vowel sounds are usually described by using the source-filter theory. In this theory, a laryngeal sound is treated as a planar sound source, and characteristics of airflow from lungs is not considered at all. In the present study, the airflow in a larynx was experimentally analyzed to clarify phonation mechanisms and seek better modeling of a laryngeal sound source. Experimental results show clearly that periodic change and high frequency fluctuation in the airflow velocity provides crucial information to create better simulation models of the phonation mechanism.