Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

3-D FEM Analysis of Sound Propagation in the Nasal and Paranasal Cavities

Hisayoshi Suzuki (1), Jianwu Dang (2), Takayoshi Nakai (1), Akira Ishida (1), Hiroshi Sakakibara (1)

(1) Dept. of Electronics, Faculty of Engineering, Shizuoka Univ., Hamamatsu, Japan
(2) ATR Human Information Processing Res. Labs., Kyoto, Japan

Six 3-D acoustic tube models of the nasal and paranasal cavities are constructed based on morphological data obtained from one male subject by Magnetic Resonance Imaging(MRI). For the models, sound propagation in the nasal tract is calculated by solving the Helmholtz equation with the 3-D finite element method (FEM). Sound pressure distributions are investigated in three dimensions. The transfer function of sound pressure from the velopharyngeal port to the nostrils is analyzed and compared with results obtained from a conventional electric circuit model. The peak frequencies in the range above 1.5 kHz are clearly lower in the transfer function obtained from FEM than that from the electric circuit model. FEM provides more powerful capabilities for a tube with a complex shape, such as the nasal cavity, than does the conventional method.

Full Paper

Bibliographic reference.  Suzuki, Hisayoshi / Dang, Jianwu / Nakai, Takayoshi / Ishida, Akira / Sakakibara, Hiroshi (1994): "3-d FEM analysis of sound propagation in the nasal and paranasal cavities", In ICSLP-1994, 171-174.