Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

Measurement of Acoustic Impedance Density Distribution in the Near Field of the Labial Horn

Kunitoshi Motoki (1), Pierre Badin (2), Nobuhiro Miki (3)

(1) Faculty of Engineering, Hokkai-Gakuen University, Sapporo, Japan
(2) Institut de la Communication Parlée-URA CNRS No368, INPG, Université Stendhal, Grenoble, France
(3) Faculty of Engineering, Hokkaido University, Sapporo, Japan

In this paper, a method for measuring the acoustic impedance density from sound pressure distribution is presented. Experiments were performed for a plaster replica of the lips together with the oral cavity and for a quasi-elliptical uniform tube with a wedged-shaped end imitating the lip horn. The change of frequency characteristics of the acoustic impedance density along the center-line inside the lips indicates that the labial horn acts as an acoustic wave guide. The theoretical characteristics of the acoustic impedance density derived from an idealized elliptical piston model and a pulsating sphere model are also shown for the better determination of the boundary condition for FEM computation.

Full Paper

Bibliographic reference.  Motoki, Kunitoshi / Badin, Pierre / Miki, Nobuhiro (1994): "Measurement of acoustic impedance density distribution in the near field of the labial horn", In ICSLP-1994, 607-610.