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Terms in this set (12)
vocal folds are what type of system?
in an ideal world, harmonic oscillations:
would go on forever because there is no friction or damping
in the real word, harmonic oscillations:
are damped and amplitude of oscillations decrease with time
why a mass spring system?
mass: vocal folds
spring system: tissue stiffness or restoring forces of vocal folds
damping: reduced energy/ energy absorption (viscosity) of the tissue
each vocal fold cycle produces?
a small puff of air
-human voice is hundreds of these small puffs or air every second being released and filtered by the vocal tract
why is the vocal tract necessary?
for sustained oscillations there has to be negative pressure within the glottis (vocal folds and space between them)- but pressure from lungs is always positive
problem: vocal folds do not move in uniform fashion, but rather in a wave-like motion from bottom to top
add two more small masses to represent the cover of the vocal fold
how are oscillations sustained?
asymmetry of air pressure is needed to sustain oscillation
air pressure larger in convergent shape (bottom of vocal folds further apart) than in divergent shape (bottom of vocal folds closer together)
the glottal signal is/is not a single sinusoid
when the vocal folds vibrate and come together, they produce an impulse with harmonic energy
glottal airflow signal is like what type of wave?
rounded sawtooth wave
glottal waveform is a _________ rich signal
glottal energy is the ______ for speech signal
-supplies the acoustic energy needed for all different speech sounds
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