A two-mass model of the vocal cords: determination of control parameters

Teffahi, Hocine

doi:10.1109/mmcs.2009.5256726

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Despite recent advances in laryngeal flow investigations, virtually all lumped-mass models of phonation continue to approximate the fluid mechanics using the Bernoulli equation, [43][44][45][46] a method that has remained relatively unchanged since it was first proposed as a glottal flow model over 50 years ago. 47 Describing the flow field with the Bernoulli equation assumes the fluid behaves throughout the phonatory cycle in a one-dimensional, steady, inviscid manner along an identifiable streamline, a gross simplification of actual reported behavior.…”

Section: Introductionmentioning

confidence: 99%

A theoretical model of the pressure field arising from asymmetric intraglottal flows applied to a two-mass model of the vocal folds

Erath

Peterson

Zañartu

et al. 2011

The Journal of the Acoustical Society of America

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A theoretical flow solution is presented for predicting the pressure distribution along the vocal fold walls arising from asymmetric flow that forms during the closing phases of speech. The resultant wall jet was analyzed using boundary layer methods in a non-inertial reference frame attached to the moving wall. A solution for the near-wall velocity profiles on the flow wall was developed based on a Falkner-Skan similarity solution and it was demonstrated that the pressure distribution along the flow wall is imposed by the velocity in the inviscid core of the wall jet. The method was validated with experimental velocity data from 7.5 times life-size vocal fold models, acquired for varying flow rates and glottal divergence angles. The solution for the asymmetric pressures was incorporated into a widely used two-mass model of vocal fold oscillation with a coupled acoustical model of sound propagation. Asymmetric pressure loading was found to facilitate glottal closure, which yielded only slightly higher values of maximum flow declination rate and radiated sound, and a small decrease in the slope of the spectral tilt. While the impact on symmetrically tensioned vocal folds was small, results indicate the effect becomes more significant for asymmetrically tensioned vocal folds.

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Section: Introductionmentioning

confidence: 99%

A theoretical model of the pressure field arising from asymmetric intraglottal flows applied to a two-mass model of the vocal folds

Erath

Peterson

Zañartu

et al. 2011

The Journal of the Acoustical Society of America

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“…The value of lung pressure P s is calculated with help of following relationships as given by Hocine Teffahi (Baken & Orlikoff, 2000), F 0 (Hz) = 2.3Ps + 48Q +1.98 (28) Assume, Q (=3) is vocal cord tension (Teffahi, 2009), which is proportional to Fundamental frequency (F 0 ).…”

Section: Resultsmentioning

confidence: 99%

Vocal Folds Analysis for Detection and Classification of Voice Disorder

Mittal

Sharma

2021

International Journal of E-Health and Medical Communications

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The detection and description of pathological voice are the most important applications of voice profiling. Currently, techniques like laryngostroboscopy or surgical microlarynoscopy are popularly used for the diagnosis of voice pathologies but are invasive in nature. Disorders of vocal folds impact the quality of voice, and therefore, the accuracy of voice profiling is reduced. This paper presents a better solution to differentiate normal and pathological voices based on the glottal, physical, and acoustic and equivalent electrical parameters. These parameters have been correlated using mathematical equations and models. Results reveal that the glottal flow is strongly influenced by physical parameters like stiffness and viscosity of vocal folds in case of pathological voice. However, their direct measurement requires complex invasive medical procedures or costly and complex electronic hardware arrangements in case of non-invasive methods. Glottal parameters, on the other hand, facilitate much simpler estimation of vocal folds disorders. In this work, the authors have presented two non-invasive approaches for better accuracy and least complexity for differentiating normal and pathological voices: 1) by using correlation of glottal and physical parameters, 2)by using acoustic and equivalent electrical parameters.

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