Influence of vocal tract geometry simplifications on the numerical simulation of vowel sounds

Marc Arnela, Saeed Dabbaghchian, Rémi Blandin, Oriol Guasch, Olov Engwall, Annemie Van Hirtum, Xavier Pelorson

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Resum

For many years, the vocal tract shape has been approximated by one-dimensional (1D) area functions to study the production of voice. More recently, 3D approaches allow one to deal with the complex 3D vocal tract, although area-based 3D geometries of circular cross-section are still in use. However, little is known about the influence of performing such a simplification, and some alternatives may exist between these two extreme options. To this aim, several vocal tract geometry simplifications for vowels [E], [i], and [u] are investigated in this work. Six cases are considered, consisting of realistic, elliptical, and circular cross-sections interpolated through a bent or straight midline. For frequencies below 4-5 kHz, the influence of bending and cross-sectional shape has been found weak, while above these values simplified bent vocal tracts with realistic cross-sections are necessary to correctly emulate higher-order mode propagation. To perform this study, the finite element method (FEM) has been used. FEM results have also been compared to a 3D multimodal method and to a classical 1D frequency domain model.

Idioma originalAnglès
Pàgines (de-a)1707-1718
Nombre de pàgines12
RevistaJournal of the Acoustical Society of America
Volum140
Número3
DOIs
Estat de la publicacióPublicada - 1 de set. 2016

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