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Influence of vocal tract geometry simplifications on the numerical simulation of vowel sounds
KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH.ORCID iD: 0000-0002-8991-1016
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2016 (English)In: Journal of Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 140, no 3, 1707-1718 p.Article in journal (Refereed) Published
Abstract [en]

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 [ɑ], [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.

Place, publisher, year, edition, pages
Acoustical Society of America (ASA), 2016. Vol. 140, no 3, 1707-1718 p.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-192600DOI: 10.1121/1.4962488OAI: oai:DiVA.org:kth-192600DiVA: diva2:971286
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EUNISON
Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2016-09-19Bibliographically approved

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Dabbaghchian, SaeedEngwall, Olov
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Speech, Music and Hearing, TMH
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