hwk10 - Chapter 15 Solution RQ1. They are the pharynx, the...

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1 Chapter 15 Solution RQ1. They are the pharynx, the nasal and oral cavities. All of them play a role in the production of speech. RQ2. The vocal folds vibrate in rapidly opening and closing. There are 3 different modes in which the vocal folds can vibrate. In the normal mode, they open and close completely during the cycle. This gives triangular shaped puffs of air as in Fig15.7 with a spectrum that falls off as 1/(n 2 ) where n is the harmonic number. In the open phase mode, the folds do not close completely over their entire length, so the air flow does not go to zero. The third mode, in which a minimum of air passes in short puffs, gives rise to a creaky voice. RQ5. The spectrum of the glottal source function is composed of harmonics that diminish in amplitude as 2 / 1 n . If these quantities are expressed in decibels, the source function decreases in strength approximately at a rate of 12dB per octave. See RQ2 and Fig. 15.7. RQ7.
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hwk10 - Chapter 15 Solution RQ1. They are the pharynx, the...

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