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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/61388998:_____/16:00453788

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BI - Akustika a kmity

OECD FORD obor

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Projekt

<a href="/cs/project/GPP101%2F12%2FP579" target="_blank" >GPP101/12/P579: Akustické rezonanční vlastnosti vokálních dutin - přímá a iverzní úloha</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Sound and Vibration

ISSN

0022-460X

e-ISSN

—

Svazek periodika

366

Číslo periodika v rámci svazku

31 March 2016

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

556-570

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-84957702335