LING 210 Lecture Notes - Lecture 5: Sound Pressure, Vocal Folds, Acoustic Wave
24 Dec 2018
School
Department
Course
Professor
Document Summary
Sources and filters and the articulation of speech. One source of speech sounds is due to the obstruction created by the vocal folds when they are put close to each such they start vibrating. The basis component of the sound generated by the vocal folds duration phonation is a simple tone. The frequency of this basic tone corresponds to the frequency with which the vocal folds are vibrating (if they vibrate faster this will generate a higher tone). Vocal fold vibration actually generates a source signal consisting of many tones, which are all multiples of the basic tone, which are called overtones" or harmonics". We return to these when talking about vowels. Tones can be characterized by the amplitude of their maximum sound pressure level and the frequency with which they reach this maximum. When the sound pressure level is plotted over time it forms a wave: The simplest acoustic waveform is such a periodic sinosoidal wave.
