Laryngeal function: Electroglottograph, ultra-high-speed films, and speech inverse filtering

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Abstract
Numerous methods have been devised to assess laryngeal function, including photography, inverse filtering of speech, electroglottography, and others. We have been conducting a series of experiments in which we record simultaneously the electroglottograph (EGG) waveform and the acoustic phonatory signal, while filming vibratory patterns of the vocal folds for both normal subjects and patients with various pathologies and vocal disorders. These data are synchronized via a special timing signal, which is recorded on the audio tape and ultra-high-speed laryngeal films. We present graphical plots of this synchronized data including (1) glottal area measured from the films, (2) the EGG waveform, (3) the speech waveform, and (4) the inverse filtered waveform. These results are being used in various ways including the verification that the EGG signal is indicative of the amount of contact between the vocal folds. Other uses of our results are obtaining better models of the source/tract coupling and the synthesis of more natural sounding speech.

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