2013/02/07 by Frank Ranostaj, Ranostaj, Frank
Computer Science · Physics and Astronomy · #Classical Physics (physics.class-ph) #FOS: Physical sciences #Medical Physics (physics.med-ph) #Speech and Audio Processing #physics.class-ph #physics.med-ph
paper · pdf · doi:10.48550/arxiv.1302.1619
in German. Correspondence between Mersenne, Trichet and Villiers added, contribution of Dodart and Ferrein clarified
openalex publication_date 2013/02/07 · arxiv created 2015/05/10 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This thesis investigates acoustic properties of the vocal tract. Starting from a historical background (to name a few: Galen, Ibn Sina/Avicenna, Mersenne, Hooke, Euler, Kempelen, Abbe Mical, Kratzenstein, Wheatstone, Helmholtz, Riesz, Dudley, Dunn, Kelly, Lochbaum, Chiba, Kajiyama, Saito, Itakura, Burg, Gray...) finaly an improvement in respect to the tube model of the vocal tract is developed: The acoustics of vocal tract is numerical simulated in 3 dimensions with Finite-difference in time-domain (FDTD) applied on an oral-cavity spatially constructed by parameter estimation of speech signals and laterally by MRI (Magnet Resonance Imaging). Further, the FDTD is applied on the acoustics of the nasal tract, including paranasal cavities. The spatial properties of the nasal tract are drawn for CT (Computer Tomographies). It is shown, that the (absolute) cross section area influences the resonance charateritic of the vocal tract significant, further the actual shape of the cross section introduces zeros in the transfer functions. The shape can be approximated by an elliptical contour, and a 2 dimensional FDTD approach is discussed. Important absorption machanism are modeled, and a method to translate the hounsfield-value of a voxel to an acoustic impedance, is shown, which leads to a more accurate simulation. The thesis further elucidates some aspects of a numerical efficient FDTD-implementation.