2007
DOI: 10.1250/ast.28.124
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Study of acoustic characteristics of vocal tract with nasal cavity during phonation of Japanese /a/

Abstract: IntroductionMRI data on the vocal tract during the production of Japanese vowels indicate coupling between the oral cavity and the nasal cavity. A large number of studies have been carried out on the nasalized vowels on the basis of a onedimensional speech production model. Acoustic analysis of the three-dimensional nasal tract has also been performed by the finite element method (FEM) [1,2]. Moreover, acoustic coupling between the oral and nasal cavities in the radiation space has been studied using simplifie… Show more

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Cited by 11 publications
(20 citation statements)
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“…In the 3-D distribution of the active sound intensity vectors at F2 for the French subject, a flow of the sound energy flux from the nostrils to the top of the pharynx is also observed, which is similar to the results for the Japanese subject [11].…”
Section: Discussionsupporting
confidence: 82%
See 2 more Smart Citations
“…In the 3-D distribution of the active sound intensity vectors at F2 for the French subject, a flow of the sound energy flux from the nostrils to the top of the pharynx is also observed, which is similar to the results for the Japanese subject [11].…”
Section: Discussionsupporting
confidence: 82%
“…Note that this nasal coupling is observed for a specific subject [11,13], although ordinary Japanese vowels do not include nasalized vowels. This study also includes an acoustic comparison between the French and Japanese /a/ with nasal coupling.…”
Section: Introductionmentioning
confidence: 98%
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“…For example, the following has been reported using these analyses: there is no significant difference between the finite element method and the boundary element method in the comparison of acoustic analyses of the vocal tract 4 ; and the presence of a pole-zero pair, which is a characteristic of a nasalized vowel, is confirmed as a result of acoustic analysis including the nasal cavity. 5 However, in these reports, the first formant (F1) and the second formant (F2) calculated from the analysis have diverged considerably from the F1 and F2 obtained from the actual voice. 4,5 Therefore, the aim was to simulate and visualize the relationship between the vocal tract and the sound produced there, that is, the form of the vocal tract and the voice, by applying acoustic analysis using the boundary element method to the articulatory organ, and then to clarify the pathogenesis of articulation disorders.…”
Section: Introductionmentioning
confidence: 87%
“…5 However, in these reports, the first formant (F1) and the second formant (F2) calculated from the analysis have diverged considerably from the F1 and F2 obtained from the actual voice. 4,5 Therefore, the aim was to simulate and visualize the relationship between the vocal tract and the sound produced there, that is, the form of the vocal tract and the voice, by applying acoustic analysis using the boundary element method to the articulatory organ, and then to clarify the pathogenesis of articulation disorders. The purposes of this study were to establish an acoustic simulation of the vocal tract and to verify the validity of the simulation.…”
Section: Introductionmentioning
confidence: 87%