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Modeling of the response of harmonically excited supraglottal
Dedouch, K. ; Horáček, Jaromír ; Vampola, T.
The goal of the paper is harmonic analysis of supraglottal acoustic space modelled by two FE models. The finite element models represent the male vocal tract in between the vocal folds and the lips. A small flexible plate vibrating in the plane of the vocal folds excites the first FE model. The second FE model is excited by the harmonic acoustic pressure applied in a small circular hole situated in the plane of vocal folds. The excited acoustic field in supraglottal space corresponding to the first FE model is identical with the acoustic modes relevant to the acoustic space with closed - open ends, i.e., to the first two formants.
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Dynamic characteristics of the human vocal tract influenced by the cleft palate
Vampola, T. ; Horáček, Jaromír ; Bauma, V.
Finite element models of supraglottal tract for Czech vowels /a/ and /u/ are analyzed considering the cleft palate. Performed acoustic modal analysis is focused on investigation of the influence of the area of cleft palate on the formant frequencies F1-F3. The results for the vowel /a/ indicate, that after a small jump of the acoustic natural frequencies for a very small cleft the frequencies F1 and F2 are influence by increasing size the cleft only very slightly. The influence of the cleft on the phonation of the vowel /u/ is considerable higher.
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3-D FE model of the human vocal folds for dynamic computations
Vampola, T. ; Horáček, Jaromír
The article describes the design of a 3D finite element (FE) model of real human vocal folds in a defined phonation position. The model was developed from the CT images of the plaster casts obtained by a special procedure during experiments with the excised human larynges. The model is determined mainly for studies of dynamical stresses in the vocal fold tissue during vocal folds collisions.
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