Effect of source–tract acoustical coupling on the oscillation onset of the vocal folds
| Autor: | Xavier Pelorson, Annemie Van Hirtum, Jorge C. Lucero, Kelem G. Lourenço, Nicolas Hermant |
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| Přispěvatelé: | Department of Mathematics [Univ. Brasilia] (UnB), Universidade de Brasilia [Brasília] (UnB), GIPSA - Group aeroacoustics, modeling and application (GIPSA-GAMA), Département Parole et Cognition (GIPSA-DPC), Grenoble Images Parole Signal Automatique (GIPSA-lab), Université Stendhal - Grenoble 3-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Stendhal - Grenoble 3-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Grenoble Images Parole Signal Automatique (GIPSA-lab), Université Stendhal - Grenoble 3-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Stendhal - Grenoble 3-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2012 |
| Předmět: |
Models
Anatomic Glottis Sound Spectrography Acoustics and Ultrasonics Acoustics Vocal Cords 01 natural sciences Speech Acoustics Articulatory phonetics 03 medical and health sciences 0302 clinical medicine Phonation Arts and Humanities (miscellaneous) 0103 physical sciences Pressure otorhinolaryngologic diseases medicine Humans 030223 otorhinolaryngology 010301 acoustics [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] Physics Oscillation PACS number(s): 43.70.Aj 43.70.Bk 43.70.Jt [AL] [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] Coupling (physics) medicine.anatomical_structure Computer Science::Sound Vocal folds Low-frequency oscillation Vocal tract Acoustic resonance |
| Zdroj: | Journal of the Acoustical Society of America Journal of the Acoustical Society of America, Acoustical Society of America, 2012, 132 (1), pp.403-411. ⟨10.1121/1.4728170⟩ |
| ISSN: | 0001-4966 1520-8524 |
| DOI: | 10.1121/1.4728170 |
| Popis: | International audience; This paper analyzes the interaction between the vocal folds and vocal tract at phonation onset due to the acoustical coupling between both systems. Data collected from a mechanical replica of the vocal folds show that changes in vocal tract length induce fluctuations in the oscillation threshold values of both subglottal pressure and frequency. Frequency jumps and maxima of the threshold pressure occur when the oscillation frequency is slightly above a vocal tract resonance. Both the downstream and upstream vocal tracts may produce those same effects. A simple mathematical model is next proposed, based on a lumped description of tissue mechanics, quasi-steady flow and one-dimensional acoustics. The model shows that the frequency jumps are produced by saddle-node bifurcations between limit cycles forming a classical pattern of a cusp catastrophe. The transition from a low frequency oscillation to a high frequency one may be achieved through two different paths: in case of a large acoustical coupling (narrow vocal tract) or high subglottal pressure, the bifurcations are crossed, which causes a frequency jump with a hysteresis loop. By reducing the acoustical coupling (wide vocal tract) or the subglottal pressure, a path around the bifurcations may be followed with a smooth frequency variation. |
| Databáze: | OpenAIRE |
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