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Unformatted text preview: 2) Constriction for Fricatives
(a) Calculated levels of the turbulence noise sources at the supraglottal and glottal (dashed line) constrictions
as a function of the area of the supraglottal constriction. The area of the glottal constriction is fixed at 0.2 cm2.
(b) Same as (a), except that the size of the constriction is modified by the presence of the intraoral pressure.
The abscissa is the area that the supraglottal constriction would assume before application of the subglottal
pressure. -~------ Ac
A2 L1 Lc 3
Frequency (kHz) A1 (A) 4 L2 A1 Low back vowel
0 L1 Frequency (kHz) Frequency (kHz) 3
Ac = 0.5 cm2
0.2 2 4
Length of back cavity, L1 (cm) 6 8 10 12 14 Frequencies of first four natural frequencies for configuration of first figure on left,
as the length L1 of the back cavity is manipulated. The total length L1+ L2 = 16 cm,
and the cross-sectional area A2 = 3 cm2. The...
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This document was uploaded on 03/19/2014 for the course EECS 6.541J at MIT.
- Spring '04