Second International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2001)

Florence, Italy
September 13-15, 2001

Effects of Transglottal Pressure on Fundamental Frequency of Phonation: Study with a Rubber Model

Kazutomo Kitajima, Hideyuki Kataoka, Shigehiro Owaki

Department of Otolaryngology, Shiga University of Medical Science, Seta, Otsu, Japan

Transglottal pressure affects fundamental frequency of phonation (Fo). When we plot Fo-change per unit change of transglottal pressure (dF/dP) as function of Fo, the values for dF/dP showed a non-linear or V-shaped relationship against Fo. In this study, we calculated the values for dF/dP with a rubber model under various condition of length and weight of the vibrating part, aiming to reproduce a similar relationship between dF/dP and Fo that has been observed in humans. The results showed that an increase in the length decreased dF/dP, and increased Fo. An increase in the weight decreased dF/dP, and decreased Fo as well. Using selected data, we were able to reproduce a V-shaped relationship between dF/dP and Fo, which is similar to that observed in humans. Based on the results, we speculate that, in humans, length-change of the vocal folds determines Fo at a lower Fo, and weight-change determines Fo at a higher Fo.

Index Terms. fundamental frequency of phonation, model experiment, transglottal pressure

Full Paper

Bibliographic reference.  Kitajima, Kazutomo / Kataoka, Hideyuki / Owaki, Shigehiro (2001): "Effects of transglottal pressure on fundamental frequency of phonation: study with a rubber model", In MAVEBA-2001, 21-26.