Intraglottal Aerodynamics at Vocal Fold Vibration Onset

Dejonckere, Philippe H.; Lebacq, Jean

doi:10.1016/j.jvoice.2019.08.002

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…High-speed video [16][17][18][19][20] requires laryngoscopy with an endoscope capable of providing sufficient illumination (300 W xenon lamp) for image frequencies of 2 to 4 kHz with a sufficient resolution (preferably at least 2000 x 2000 pixels). Singleline scanning (videokymography) is an imaging technique based on a special digital camera mounted on a 90° rigid (Wolf 4450.57; CE 0124) laryngeal telescope with a focusing handle [21,22].…”

Section: Morphometry Of the Glottismentioning

confidence: 99%

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The Physics of the Human Vocal Folds as a Biological Oscillator

Henri DeJonckere,

Lebacq

2024

New Insights on Oscillators and Their Applications to Engineering and Science

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The human voice results from the vibration of air at the vocal folds (VF), which behave as a damped oscillator controlled by intraglottic pressure and tranglottic airflow. This chapter presents a complete synthesis of the physics of vocal dynamics (1) during a sustained oscillation, particularly with regard to the phase relationship between intraglottic pressure and glottal opening and closing; (2) during the onset of the oscillation, particularly with regard to the mechanism explaining the triggering of the initiation of the oscillation; and (3) during the decay of the damped oscillations during voice offset, particularly with regard to the effect of lung volume. The importance of air volume as an essential component of the vibratory system is highlighted. The experimental data are obtained in vivo by simultaneous measurement of the transglottic flow and the glottic surface, which allows the calculation of the intraglottic pressure and its interaction with the inertia of the vocal tract.

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Section: Morphometry Of the Glottismentioning

confidence: 99%

“…In computational fluid dynamics, an important parameter is the 'equivalent diameter' (compared to a cylindrical tube) [40]. The contour of the glottic image can be well fitted by an ellipse (see below, under the heading 2.3.1.…”

Section: Glottal Area Calculationmentioning

confidence: 99%

The Physics of the Human Vocal Folds as a Biological Oscillator

Henri DeJonckere,

Lebacq

2024

New Insights on Oscillators and Their Applications to Engineering and Science

Self Cite

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“…In fluid mechanics calculations, an important issue is the 'equivalent diameter' (with respect to a cylindrical pipe) [47]. The shape of the glottis is not cylindrical; thus, an expression must be found to calculate an equivalent diameter of the glottis to be introduced in the adequate equations.…”

Section: Computing the Glottal Area [11]mentioning

confidence: 99%

Experimenting ‘In Vivo’ with Dynamic Glottal Parameters: Methodological Issues, Technical Tips & Tricks and Preventable Pitfalls

DeJonckere,

Lebacq,

DeJonckere

2023

PNEURO

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‘In vivo’ studies pertaining to dynamics of vocal fold vibration motion, to vocal fold contact and collision, to vocal onset and offset and to mechanical efficiency all need valid, sensitive and precise measurements of the different mechanical parameters involved. This is also true for investigating the physiological correlates of particular acoustic events like register breaks or diplophonia. The main physical parameters involved are: vocal fold movement and shaping, particularly the velocity of tissue displacement, glottal area, tissue distortion, intraglottal pressure, transglottal air flow, vocal fold contact and collision stress, etc. This article presents a critical review of the instruments and techniques involved in the direct measurements of the glottal dimensions and movements, the transglottal airflow, the VF contact changes, the pressures and the sound acoustic pressure. In each case are analyzed the methodological aspects that are critical for validly calibrating and synchronizing these signals, and correcting them for time delays. Moreover, it is shown how new parameters, like vocal fold velocity, intraglottal pressure, vocal fold collision stress, can be inferred from these (raw or after differentiation) signals by combining them. Finally, the discussion focuses on weighing advantages and limitations of techniques for monitoring the glottal area, i.e. photometry and the high-speed imaging, the latter involving the relevance in this scope of future developments in endoscopic and external imaging techniques, and in image processing software. Our aim is to facilitate the work of future researchers by showing how to solve important technical pitfalls, how to apply the necessary corrective measures - and which ones - where needed, and how to get the most out of combinatorial measures.

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Lung volume affects the decay of oscillations at the end of a vocal emission

Dejonckere

Lebacq²

2020

Biomedical Signal Processing and Control

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Intraglottal Aerodynamics at Vocal Fold Vibration Onset

Cited by 5 publications

References 16 publications

The Physics of the Human Vocal Folds as a Biological Oscillator

The Physics of the Human Vocal Folds as a Biological Oscillator

Experimenting ‘In Vivo’ with Dynamic Glottal Parameters: Methodological Issues, Technical Tips & Tricks and Preventable Pitfalls

Lung volume affects the decay of oscillations at the end of a vocal emission

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