The Source-Filter Theory of Speech Production / Speech Acoustics for Vowels Flashcards
source filter theory
larynx (source) +vocal tract (filter) = output
light analogy
formants based on where light source and windows are located
the source
larynx
•Application: Electrolarynx (artificial larynx) hold device to throat and by activating device you bypass larynx and get a speech sound
the filter
vocal tract
bringing source and filter together we can make a
artificial vocal tract
The signal finally dissipates from the lips into
air where it is transmitted as pressure variations through space
all notes have the same
pitch but differ in filter
resonance frequency
objects/materials preferred frequency
resonating frequencies of the cylindrical tubes closely related to vocal tract when what is produced
schwa
quarter wave length resonantor
- first resonance
- open at one end closed at other
- length of wave is 4 times length of the tube
if close lips you create a
half-wavelength resonator
air pressure at nodes
high
air pressure at anti-nodes
low
vowel schwa represented by tubes
- open one end
- closed one end
- 1/4 wavelength resonator
- 1st resonance 500Hz
- 2nd resonance 1500 Hz
do formant frequencies have to do fundamental frequency why?
NO formant frequencies are properties of vocal tract
