Frequency jumps in excised larynges in anechoic conditions: A pilot study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F23%3A73618865" target="_blank" >RIV/61989592:15310/23:73618865 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15110/23:73618865 RIV/00098892:_____/23:10157993

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022460X23000561" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022460X23000561</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jsv.2023.117607" target="_blank" >10.1016/j.jsv.2023.117607</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Frequency jumps in excised larynges in anechoic conditions: A pilot study

Popis výsledku v původním jazyce

Sudden fundamental frequency jumps between chest and falsetto registers are among the least understood phenomena occurring in human voice. Such jumps are recognized as bifurcation events and have been assumed to result from nonlinear-dynamic properties of the vocal folds interacting with acoustic resonances of the vocal tract and of the subglottal tract (ST). Here, we explored an anechoic (resonance-free) ST and investigated these frequency jumps in five excised human larynges under two conditions: (a) anechoic and (b) subglottally resonant without a vocal tract. When smoothly elongating the vocal folds, we observed consistent jumps in anechoic conditions, proving that subglottal and vocal tract resonances are not necessary for the jumps to arise. The presence of a resonant ST did not result in more numerous jumps compared to anechoic conditions, indicating that the inherent nonlinear-dynamic properties of the larynges were the primary cause for the jumps. Nevertheless, the resonant ST slightly altered the initial and terminating frequencies of the jumps suggesting that the role of interaction of the vocal fold oscillations with subglottal acoustics should not be neglected. These experimental findings should be considered when validating mathematical models simulating the nonlinear-dynamic behavior of the human vocal apparatus.

Název v anglickém jazyce

Frequency jumps in excised larynges in anechoic conditions: A pilot study

Popis výsledku anglicky

Sudden fundamental frequency jumps between chest and falsetto registers are among the least understood phenomena occurring in human voice. Such jumps are recognized as bifurcation events and have been assumed to result from nonlinear-dynamic properties of the vocal folds interacting with acoustic resonances of the vocal tract and of the subglottal tract (ST). Here, we explored an anechoic (resonance-free) ST and investigated these frequency jumps in five excised human larynges under two conditions: (a) anechoic and (b) subglottally resonant without a vocal tract. When smoothly elongating the vocal folds, we observed consistent jumps in anechoic conditions, proving that subglottal and vocal tract resonances are not necessary for the jumps to arise. The presence of a resonant ST did not result in more numerous jumps compared to anechoic conditions, indicating that the inherent nonlinear-dynamic properties of the larynges were the primary cause for the jumps. Nevertheless, the resonant ST slightly altered the initial and terminating frequencies of the jumps suggesting that the role of interaction of the vocal fold oscillations with subglottal acoustics should not be neglected. These experimental findings should be considered when validating mathematical models simulating the nonlinear-dynamic behavior of the human vocal apparatus.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10307 - Acoustics

Projekt

<a href="/cs/project/GA19-04477S" target="_blank" >GA19-04477S: Modelování a měření strukturálně-akustických interakcí s prouděním v biomechanice tvorby hlasu člověka</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

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

1095-8568

Svazek periodika

551

Číslo periodika v rámci svazku

MAY

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

"117607-1"-"117607-8"

Kód UT WoS článku

000948584500001

EID výsledku v databázi Scopus

2-s2.0-85148539849