Abstract
It is generally considered that phonation is mainly controlled by two factors, i.e., the driving force and the laryngeal adjustment. Many aerodynamic studies on phonation control have been conducted. However, only the mean value of air flow and subglottal pressure were measured and reported in these studies. The airflow at the lips, the subglottal pressure, the supraglottal pressure, and the electromyograms of the thyroarytenoid (TA) and the cricothyroid (CT) muscles were simultaneously recorded in the present study. The waveforms of glottal airflow, transglottal pressure, and glottal resistance were extracted from the airflow and the pressure signals. The precise mechanism of phonation control was investigated using these signals. In case of high pitch phonation, the intensity of voice was found to be controlled mainly by driving force. On the contrary, the intensity was controlled mainly by laryngeal adjustment in case of low pitch phonation.
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