Numerical investigation of effects of incisor angle on production of sibilant /s/

Abstract The effects of the inclination angle of the incisor on the speech production of the fricative consonant /s/ was investigated using an implicit compressible flow solver. The hierarchical structure grid was applied to reduce the grid generation time for the vocal tract geometry. The airflow a...

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Autores principales:	HsuehJui Lu, Tsukasa Yoshinaga, ChungGang Li, Kazunori Nozaki, Akiyoshi Iida, Makoto Tsubokura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c4ab67af469344e2a877e721e42ca094
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spelling	oai:doaj.org-article:c4ab67af469344e2a877e721e42ca0942021-12-02T15:10:39ZNumerical investigation of effects of incisor angle on production of sibilant /s/10.1038/s41598-021-96173-22045-2322https://doaj.org/article/c4ab67af469344e2a877e721e42ca0942021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96173-2https://doaj.org/toc/2045-2322Abstract The effects of the inclination angle of the incisor on the speech production of the fricative consonant /s/ was investigated using an implicit compressible flow solver. The hierarchical structure grid was applied to reduce the grid generation time for the vocal tract geometry. The airflow and sound during the pronunciation of /s/ were simulated using the adaptively switched time stepping scheme, and the angle of the incisor in the vocal tract was changed from normal position up to 30°. The results showed that increasing the incisor angle affected the flow configuration and moved the location of the high turbulence intensity region thereby decreased the amplitudes of the sound in the frequency range from 8 to 12 kHz. Performing the Fourier transform on the velocity fluctuation, we found that the position of large magnitudes of the velocity at 10 kHz shifted toward the lip outlet when the incisor angle was increased. In addition, separate acoustic simulations showed that the shift in the potential sound source position decreased the far-field sound amplitudes above 8 kHz. These results provide the underlying insights necessary to design dental prostheses for the production of sibilant fricatives.HsuehJui LuTsukasa YoshinagaChungGang LiKazunori NozakiAkiyoshi IidaMakoto TsubokuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q HsuehJui Lu Tsukasa Yoshinaga ChungGang Li Kazunori Nozaki Akiyoshi Iida Makoto Tsubokura Numerical investigation of effects of incisor angle on production of sibilant /s/
description	Abstract The effects of the inclination angle of the incisor on the speech production of the fricative consonant /s/ was investigated using an implicit compressible flow solver. The hierarchical structure grid was applied to reduce the grid generation time for the vocal tract geometry. The airflow and sound during the pronunciation of /s/ were simulated using the adaptively switched time stepping scheme, and the angle of the incisor in the vocal tract was changed from normal position up to 30°. The results showed that increasing the incisor angle affected the flow configuration and moved the location of the high turbulence intensity region thereby decreased the amplitudes of the sound in the frequency range from 8 to 12 kHz. Performing the Fourier transform on the velocity fluctuation, we found that the position of large magnitudes of the velocity at 10 kHz shifted toward the lip outlet when the incisor angle was increased. In addition, separate acoustic simulations showed that the shift in the potential sound source position decreased the far-field sound amplitudes above 8 kHz. These results provide the underlying insights necessary to design dental prostheses for the production of sibilant fricatives.
format	article
author	HsuehJui Lu Tsukasa Yoshinaga ChungGang Li Kazunori Nozaki Akiyoshi Iida Makoto Tsubokura
author_facet	HsuehJui Lu Tsukasa Yoshinaga ChungGang Li Kazunori Nozaki Akiyoshi Iida Makoto Tsubokura
author_sort	HsuehJui Lu
title	Numerical investigation of effects of incisor angle on production of sibilant /s/
title_short	Numerical investigation of effects of incisor angle on production of sibilant /s/
title_full	Numerical investigation of effects of incisor angle on production of sibilant /s/
title_fullStr	Numerical investigation of effects of incisor angle on production of sibilant /s/
title_full_unstemmed	Numerical investigation of effects of incisor angle on production of sibilant /s/
title_sort	numerical investigation of effects of incisor angle on production of sibilant /s/
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c4ab67af469344e2a877e721e42ca094
work_keys_str_mv	AT hsuehjuilu numericalinvestigationofeffectsofincisorangleonproductionofsibilants AT tsukasayoshinaga numericalinvestigationofeffectsofincisorangleonproductionofsibilants AT chunggangli numericalinvestigationofeffectsofincisorangleonproductionofsibilants AT kazunorinozaki numericalinvestigationofeffectsofincisorangleonproductionofsibilants AT akiyoshiiida numericalinvestigationofeffectsofincisorangleonproductionofsibilants AT makototsubokura numericalinvestigationofeffectsofincisorangleonproductionofsibilants
_version_	1718387719098335232

Numerical investigation of effects of incisor angle on production of sibilant /s/

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