ASLP 3030 Exam 2: Source Filter Theory

the source of a sound and the filter that shapes the sounds

What are the two stages of the source filter theory

source filter theory

explains why vowels of the same timbre can be produced on different pictures, and why vowels of the same pitch can have different timbres

source filter theory

helps us quantify vowels, since we can separately measure the source and the filter

source

the input of acoustic energy into the speech production system

periodically

If the vocal folds are close together, then air pressure from the lungs can cause them to vibrate ___________, generating voicing

complex

vocal fold vibration produces a _________ periodic wave whos spectrum contains energy at the fundamental frequency of larngeal vibrations and multiples of the fundamental frequency (harmonics)

noise source

Air turbulence generated at an obstruction involves random (aperiodic) pressure fluctuations over a wide range of frequencies

aspiration

noise generated in the glottis

frication

noise generated elsewhere

F A sound may involve more than one source

T/F A sound cannot involve more than one source

filters

resonators designed to modify the frequency of vibrating objects

attenuated

frequencies whose amplitudes are reduced by thefilter

acoustic filter

selectively attenuates certain frequencies and allows other frequencies to pass through relatively unattenuated

filter

The vocal tract provides resonance and acts as a _____, modifying the source waveform

source

periodicity and pitch, intensity, duration, phonation quality, and harmonic frequencies represent...

filter

vowel height, vowel advancement, rounding, consonant features, and formant frequency represent...