CSD-2260 Lecture Notes - Lecture 16: Speech Perception, Vocal Folds, Whistle Register
20 Oct 2016
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Document Summary
Termination of phonation: abduction of vocal folds. Sustained phonation: purpose of sustained phonation. Adduction and abduction for speech: sustained phonation depends on: Connected speech: phonation must be initiated and terminated repeatedly in connected speech. Has seven laryngeal adjustments in one second. Vocal registers: differences in modes of vibration for phonation, three major types of vocal registers. Vocal folds open and close from inferior to superior. Minimum driving force is 3-5 cm h2o for 5 seconds. Crackly voice quality: voice rough and low in pitch, may indicate respiratory illness. Vocalis is tense so vibrating margin is flaccid and thick. Vocal folds spend up to 90% of the time in approximation. Third and highest register of phonation: vocal sounds higher than normal range, vocal folds lengthen and become very thin, requires increased vocal fold tension, vocal folds make brief contact. Not a mode of phonation but a product of turbulence on the edge of the vocal fold: two variations of modal phonation.
