This paper presents the effects of a wall impedance on the propagation of higher-order modes in a three-dimensional vocal-tract model. This model is constructed using an asymmetrically connected structure of rectangular acoustic tubes, and can parametrically represent acoustic characteristics in higher frequencies where the assumption of the plane wave propagation does not hold. The propagation constants of the higher-order modes are calculated taking account of the wall impedance. The resonance characteristics of the vocal-tract model are evaluated based on the transfer impedance between an input volume velocity and an output sound-pressure.
Bibliographic reference. Motoki, Kunitoshi (2010): "Effects of wall impedance on transmission and attenuation of higher-order modes in vocal-tract model", In INTERSPEECH-2010, 1013-1016.