Sixth International Conference on Spoken Language Processing
(ICSLP 2000)

Beijing, China
October 16-20, 2000

Sound Pressure Distributions and Propagation Paths in the Vocal Tract with the Pyriform Fossa and the Larynx

Takayoshi Nakai (1), Keizo Ishida (1), Hisayoshi Suzuki (2)

(1) Department of Electrical and Electronic Engineering, Faculty of Engineering, Shizuoka University,Hamamatsu, Japan Hamamatsu, Japan
(2) Faculty of Science and Technology, Tohoku Bunka University, Aoba-ku, Sendai, Japan

We have constructed models /i/ and /u/ of the vocal tract from the glottis to the velum with the pyriform fossa and the larynx, and have analyzed by finite element method. Sound pressure distributions in XY cross-sections at 500Hz, the first resonant frequencies, and 2500Hz are shown. The barycentric coordinates of real part of the sound intensity and of sound particle velocity in each XY cross-section are shown. It is found that sound in the vocal tract is not always propagated as a plane wave even when its frequency is low such as 500Hz. Paths of sound propagation are shown. We show the reason why the first resonant frequencies are different in the vocal tract with and without the pyriform fossa.

Full Paper

Bibliographic reference.  Nakai, Takayoshi / Ishida, Keizo / Suzuki, Hisayoshi (2000): "Sound pressure distributions and propagation paths in the vocal tract with the pyriform fossa and the larynx", In ICSLP-2000, vol.4, 89-92.