Abstract
Simultaneous physiological measurements were made for several articulartory functions during connected speech. Electromyographic (EMG) activity in three laryngeal muscles, subglottal air pressure, transillumination of vocal-cord motion, and the speech sound wave were recorded on multitrack FM tape. The data were obtained in a clinical environment by Dr. Thomas Shipp of the San Francisco Veterans Hospital. These data were then digitized using a multiplexed seven-channel A/D converter with a sampling rate of 6250 Hz per channel. Computer analysis was performed to study relationships between the physiological data and articulatory events. The three EMG signals (representing, respectively, the activity of the posterior crico-arytenoid, the thyroarytenoid, and the crico-thyroid muscles) were processed to display their energy as a function of time. The time variation of fundamental frequency (voice pitch) was analyzed from the speech waveform, from the fine-structure variations in the subglottal pressure, and from the transillumination of vocal-cord motion. Further, voiced/unvoiced distinctions were analyzed from the speech waveform and from the transillumination data. The results permit correlations to be calculated between the EMG signals and the dynamic behavior of the vocal-cord system.
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