Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations

Abstract Excised larynges serve as natural models for studying behavior of the voice source. Acoustic resonances inside the air-supplying tubes below the larynx (i.e., subglottal space), however, interact with the vibratory behavior of the larynges and obscure their inherent vibration properties. He...

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Autores principales:	Hugo Lehoux, Vít Hampala, Jan G. Švec
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5ee22985a9f34ee8b26efe9ce714c241
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spelling	oai:doaj.org-article:5ee22985a9f34ee8b26efe9ce714c2412021-12-02T15:13:12ZSubglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations10.1038/s41598-020-79265-32045-2322https://doaj.org/article/5ee22985a9f34ee8b26efe9ce714c2412021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79265-3https://doaj.org/toc/2045-2322Abstract Excised larynges serve as natural models for studying behavior of the voice source. Acoustic resonances inside the air-supplying tubes below the larynx (i.e., subglottal space), however, interact with the vibratory behavior of the larynges and obscure their inherent vibration properties. Here, we explore a newly designed anechoic subglottal space which allows removing its acoustic resonances. We performed excised larynx experiments using both anechoic and resonant subglottal spaces in order to analyze and compare, for the very first time, the corresponding subglottal pressures, electroglottographic and radiated acoustic waveforms. In contrast to the resonant conditions, the anechoic subglottal pressure waveforms showed negligible oscillations during the vocal fold contact phase, as expected. When inverted, these waveforms closely matched the inverse filtered radiated sound waveforms. Subglottal resonances modified also the radiated sound pressures (Level 1 interactions). Furthermore, they changed the fundamental frequency (f o ) of the vocal fold oscillations and offset phonation threshold pressures (Level 2 interactions), even for subglottal resonance frequencies 4–10 times higher than f o . The obtained data offer the basis for better understanding the inherent vibratory properties of the vocal folds, for studying the impact of structure-acoustic interactions on voice, and for validation of computational models of voice production.Hugo LehouxVít HampalaJan G. ŠvecNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hugo Lehoux Vít Hampala Jan G. Švec Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
description	Abstract Excised larynges serve as natural models for studying behavior of the voice source. Acoustic resonances inside the air-supplying tubes below the larynx (i.e., subglottal space), however, interact with the vibratory behavior of the larynges and obscure their inherent vibration properties. Here, we explore a newly designed anechoic subglottal space which allows removing its acoustic resonances. We performed excised larynx experiments using both anechoic and resonant subglottal spaces in order to analyze and compare, for the very first time, the corresponding subglottal pressures, electroglottographic and radiated acoustic waveforms. In contrast to the resonant conditions, the anechoic subglottal pressure waveforms showed negligible oscillations during the vocal fold contact phase, as expected. When inverted, these waveforms closely matched the inverse filtered radiated sound waveforms. Subglottal resonances modified also the radiated sound pressures (Level 1 interactions). Furthermore, they changed the fundamental frequency (f o ) of the vocal fold oscillations and offset phonation threshold pressures (Level 2 interactions), even for subglottal resonance frequencies 4–10 times higher than f o . The obtained data offer the basis for better understanding the inherent vibratory properties of the vocal folds, for studying the impact of structure-acoustic interactions on voice, and for validation of computational models of voice production.
format	article
author	Hugo Lehoux Vít Hampala Jan G. Švec
author_facet	Hugo Lehoux Vít Hampala Jan G. Švec
author_sort	Hugo Lehoux
title	Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
title_short	Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
title_full	Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
title_fullStr	Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
title_full_unstemmed	Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
title_sort	subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5ee22985a9f34ee8b26efe9ce714c241
work_keys_str_mv	AT hugolehoux subglottalpressureoscillationsinanechoicandresonantconditionsandtheirinfluenceonexcisedlarynxphonations AT vithampala subglottalpressureoscillationsinanechoicandresonantconditionsandtheirinfluenceonexcisedlarynxphonations AT jangsvec subglottalpressureoscillationsinanechoicandresonantconditionsandtheirinfluenceonexcisedlarynxphonations
_version_	1718387571521748992

Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations

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