Further studies of phonation threshold pressure in a physical model of the vocal fold mucosa

The Journal of the Acoustical Society of America
Roger W ChanM R Titze

Abstract

This paper reports results of further experimentation on a previously developed physical model of the vocal-fold mucosa [Titze et al., J. Acoust. Soc. Am. 97, 3080-3084 (1995)]. The effects of vocal-fold thickness, epithelial membrane thickness, and prephonatory glottal geometry on phonation threshold pressure were studied. Phonation threshold pressures in the range of 0.13 to 0.34 kPa were observed for an 11-mm-thick vocal fold with a 70-micron-thick "epithelial" membrane for different "mucosal" fluid viscosities. Higher threshold pressure was always obtained for thinner vocal folds and thicker membranes. In another set of experiments, lowest offset threshold pressure was obtained for a rectangular or a near-rectangular prephonatory glottis (with a glottal convergence angle within about +/- 3 degrees). It ranged from 0.07 to 0.23 kPa for different glottal half-widths between 2.0 and 6.0 mm. The threshold for more convergent or divergent glottal geometries was consistently higher. This finding only partially agrees with previous analytical work which predicts a lowest threshold for a divergent glottis. The discrepancy between theory and data is likely to be associated with flow separation from a divergent glottis.

References

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Citations

May 11, 2002·Journal of Voice : Official Journal of the Voice Foundation·Susan L ThibeaultCharles N Ford
Jul 13, 1999·The Laryngoscope·R W Chan, I R Titze
Sep 24, 2002·The Journal of the Acoustical Society of America·Ingo R Titze, Brad H Story
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Jan 28, 1999·The Journal of the Acoustical Society of America·J C Lucero
Oct 26, 1999·The Journal of the Acoustical Society of America·R W Chan, I R Titze
Sep 26, 2014·Current Opinion in Otolaryngology & Head and Neck Surgery·Jack J Jiang, Allison L Maytag
Apr 12, 2011·The Journal of the Acoustical Society of America·Brian A Pickup, Scott L Thomson
Feb 12, 2009·The Journal of the Acoustical Society of America·Zhaoyan Zhang
Sep 23, 2014·The Journal of the Acoustical Society of America·Ingo R Titze
Jun 7, 2007·The Journal of the Acoustical Society of America·Jack J Jiang, Chao Tao
Nov 4, 2005·The Journal of the Acoustical Society of America·Laura L KoenigJorge C Lucero
Mar 25, 2011·The Journal of the Acoustical Society of America·Jorge C LuceroXavier Pelorson
Dec 2, 2006·The Journal of the Acoustical Society of America·Zhaoyan ZhangDavid A Berry
May 9, 2012·The Journal of the Acoustical Society of America·Simeon L Smith, Scott L Thomson
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