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(36)¡¡A parametric acoustic model to characterize three-dimensional vocal-tract configuration
¡¡¡¡¡¡¡¡¡¡¡¡Hokkaido workshop on speech production,2-6,pp.32-33,1998-8.
In this paper, an acoustic model of the vocal-tract with the coupling of the higher-order modes, including both propagative and evanescent modes, is proposed. A cascaded structure of acoustic tubes connected asymmetrically is introduced as a physical approximation of the 3-D vocal-tract. The acoustic characteristics that are dependent not only on the vocal-tract area function but also on the vocal-tract configuration can be investigated by the proposed model. Preliminary results of numerical computations for relatively simple configurations suggest that additional resonances in the higher frequencies above 4.3kHz are formed by the propagative higher-order modes, and the resonances in the lower frequencies below 3 kHz are influenced by the evanescent high-order modes.
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