Measurement and mathematical simulation of acoustic characteristics of an artificially lengthened vocal tract

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61384984%3A51110%2F16%3AN0000009" target="_blank" >RIV/61384984:51110/16:N0000009 - isvavai.cz</a>
Alternative codes found
RIV/61388998:_____/16:00453788
Result on the web
<a href="http://dx.doi.org/10.1016/j.jsv.2015.12.018" target="_blank" >http://dx.doi.org/10.1016/j.jsv.2015.12.018</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jsv.2015.12.018" target="_blank" >10.1016/j.jsv.2015.12.018</a>

Result language
angličtina
Original language name
Measurement and mathematical simulation of acoustic characteristics of an artificially lengthened vocal tract
Original language description
Phonation into tubes is used for voice training and therapy. In the present study, the formant frequencies were estimated from measurements of the acoustic pressure and the acoustic input impedance for a plexiglass model of the vocal tract (VT) prolonged by a glass tube. Similar transfer function measurements were performed with a human VT in vivo. The experimental results matched the mathematical modelling and confirmed the legitimacy of assuming rigid walls in mathematical simulations of the acoustic characteristics of an artificial VT model prolonged by a tube. However, this study also proved a considerable influence from soft tissues in the yielding walls of human VT cavities on the first formant frequency, F1. The measured F1 for the VT model corresponded to the computed value of 78 Hz. The experiments in a human instead resulted in a much higher value of F1: about 200 Hz. The results confirm that a VT model with yielding walls must be considered for mathematical modelling of the occluded or semi-occluded human vocal tract, e.g. prolonged by tubes or straws. This is explained by an acoustic-structural interaction of the vocal tract cavities with a mechanical low-frequency resonance of the soft tissue in the larynx.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BI - Acoustics and oscillation
OECD FORD branch
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Project
<a href="/en/project/GPP101%2F12%2FP579" target="_blank" >GPP101/12/P579: Acoustical resonance properties of vocal cavities - direct and inverse task</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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