National Repository of Grey Literature 16 records found  previous11 - 16  jump to record: Search took 0.01 seconds. 
Vliv geometrického tvaru hlasového ústrojí člověka na výslovnost českých hlásek
Vampola, T. ; Horáček, Jaromír
1D and 3D finite element models of supraglottal tract designed for Czech vowel /a/ are analyzed. Performed modal analysis is focused on formant frequencies. For tuning of the human vocal tract model according to measured acoustic pressure in front of the lips the multi objective optimization method is used.
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.
Numerical modelling of effect of tonsilectomy on production of Czech vowels /a/ and /i/ based on FE model of human vocal tract
Švancara, Pavel ; Horáček, Jaromír
Finite element models of the human vocal tract for the Czech vowels /a/ and /i/ were modified by adding acoustic spaces that occurs after tonsilectomy. The resonant characteristics of the models were studied and then the pronunciation of the vowels was simulated. The results show that tonsilectomy causes frequency shift of 3rd (~180 Hz) and 4th (~120 Hz) formants to lower frequencies for vowel /a/ and frequency shift down of 2nd, 4th and 5th formant for vowel /i/ (all ~100 Hz).
Počítačová simulace lidského hlasu s využitím aeroelastického modelu hlasivek a MKP modelu vokálního traktu člověka
Horáček, Jaromír ; Šidlof, Petr ; Švec, J. G. ; Griffond-Boitier, F.
The developed finite element (FE) model of real male vocal tract that corresponds to the Czech vowel /a/ is used for numerical simulation of phonation. The FE model was designed from the magnetic resonance images (MRI) of the subject during phonation. The acoustic signals for the vowel /a/ are simulated using the transient analysis of the FE model in time domain. For excitation of the acoustic supraglottal spaces the intraglottal pressure generated by the aeroelastic model of vocal folds self-oscillations is used. The frequency and time response functions are calculated in front of the mouth.

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