No math calculations multiple choice, fill in the blank, etc. Homework 1 due in conference friday, january 22nd. Keeps food and other things out of your lungs. Keeps the right things in your mouth and the wrong things out. Generates a periodic source signal for voiced sounds. Changes the shape of the vocal tract and the sound wave. You cannot compress it for it to be any smaller. In order for the tongue to move up, it needs to get squished front to back, etc. Consonants: produced with a substantial constriction in the vocal tract. Vowels: produced with less constriction (you have constricted the path through which the air can travel) Consonants: have less acoustic energy than vowels, may involve intervals of silence or noise. Consonants: typically cannot be syllable nuclei (except syllabic consonants, by definition). Noise: restricting airflow in different places produces different types of noise. Resonances: changing the shape of the vocal tract changes its resonant frequencies.