2aSC3. Glottal geometry and phonation threshold pressure in a vocal fold physical model.

Session: Tuesday Morning, May 14

Time: 9:00

Author: Roger W. Chan
Author: Ingo R. Titze
Author: Michael R. Titze
Location: Dept. of Speech Pathol. and Audiol. and Natl. Ctr. for Voice and Speech, Univ. of Iowa, Iowa City, IA 52242


The effect of convergent and divergent prephonatory glottal geometries on phonation threshold pressure was investigated using a previously reported physical model of the vocal fold mucosa [Titze et al., J. Acoust. Soc. Am. 97, 3080--3084 (1995)]. Lowest offset phonation threshold pressure in the range of 0.07 to 0.23 kPa was obtained for a rectangular or a near-rectangular glottis (with convergent or divergent angle (less than or equal to)3(degrees)) across different glottal half-widths between 2.0 and 6.0 mm. Phonation threshold pressure for more convergent or divergent glottal geometries was consistently higher. This finding only partially agrees with previous analytical work which predicts a lowest phonation threshold pressure for a divergent glottis [I. R. Titze, J. Acoust. Soc. Am. 83, 1536--1552 (1988) and J. C. Lucero, J. Acoust. Soc. Am. 98, 779--784 (1995)]. The discrepancy between theory and data is likely to be associated with flow separation from a divergent glottis. [Work supported by NIH.]

from ASA 131st Meeting, Indianapolis, May 1996