SPEC 1179 Study Guide - Midterm Guide: Vocal Folds, Vocal Tract, Tuning Fork
12 Dec 2019
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Document Summary
It is important to understand perception and production of speech sounds to become a competent and efficient clinician. In speech, air in the vocal tract sets into vibration by the vocal folds. As vocal folds adduct and abduct, pulses of air from the lungs act like sharp taps on air molecules in the vocal tract, like the tuning fork. From milliseconds to seconds, move back 3 decimals. Humans threshold of hearing ranges from 20 20,000 hz and includes a lot of territory. Threshold of human hearing at 1000hz is expressed as 1 x 10^ -12 or 0db. A soundwave is 10 times as intense would be 1 x 10^ -11 or 10db. Frequency of complex wave is always equal to lowest component sine wave (fundamental frequency). Closed and open tube f = c/4l. Ix glossopharyngeal: x vagus, xii hypoglossal, xi accessory. Innervate muscles that dilate larynx and upper airway upon inspiration.
