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Acoustic modal analysis of male vocal tract for Czech vowels
Dedouch, K. ; Horáček, Jaromír ; Vampola, T. ; Švec, J. G. ; Kršek, P. ; Havlík, R.
Acoustic frequency-modal characteristics of six finite element models of a male vocal tract are presented and analysed. The FE models correspond to the vocal tract geometries for the Czech vowels /a/, /e/, /i/, /o/, /u/ and /y/ were obtained using the magnetic resonance imaging technique. The computed results of the acoustaic modal analysis are in a reasonable agreement with the data on formants known form the Czech phonetic literature.
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Finite element modeling of male vocal tract considering cleft palate
Dedouch, K. ; Horáček, Jaromír ; Vampola, T. ; Černý, L.
The FE models of vocal tract designed for vowel /a/ are analyzed considering the cleft palate. The first is designed using the published data, the second model corresponds to the reaal mate vocal tract designed by MRI data. Acoustic modal analysis is focused on investigation of the influence of the cleft palate on the formant frequencies. The results indicate, that after a small jump of the frequencies for a small cleft area the formant frequencies F1, F2 are influenced by the size of the cleft palate only very slightly.
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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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