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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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Numerical analysis of aeroelastic behaviour ot the vocal folds
Horáček, Jaromír ; Švec, J. G.
The study contributes to a more profound understanding of the mechanism of human voice production. The contribution is a continuation of recent studies of the authors where an original mathematical model for vibration of the vocal folds in the airflow coming from the human subglottal tract was developed. The model of the vocal fold was designed as a dynamic system with two degrees of freedom vibrating in the wall of a channel conveying air. Unsteady 1D flow theory for the inviscid incompressible fluid was used for the airflow. Here we present the results of the numerical solution which yields the vibration characteristics (eigenfrequencies, mode shapes of vibration and damping) of the aeroelastic system including the instability thresholds.
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