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Séminaire du département Parole et Cognition du 30/11/2017 à 10h00

 

Unified numerical simulations of voice all the way from biomechanics to sound - are we there yet?

Intervenant : Oriol Guasch, Department of Engineering, Universitat Ramon Llull

Lieu : Salle B 314, Site Ampere , Gipsa Lab 3ème étage, 11 Rue des Maths

 

Résumé :

Muscle activations position the articulators, which define a vocal tract geometry and posture the vocal folds. Air emanating from the lungs induces self-oscillations of the vocal folds, which result in aeroacoustic sources and the subsequent propagation of acoustic waves inside the vocal tract. There, many things could happen. For instance, the air could resonate to generate vowels, or, at constrictions, airflow may be accelerated to create turbulent sounds such as fricatives. The vocal tract walls are flexible and react to the inner acoustic pressure. Also, articulators can change the vocal tract geometry to generate vowel-vowel utterances or syllables. Sound is finallyradiated from the mouth.

Numerical methods have revealed as a very powerful tool for the realistic simulation of all those complex phenomena. However, attempting unified 3D numerical simulations of all the above processes, which involve coupling of a biomechanical model and the mechanical, fluid and acoustic fields, may seem unwise. Unified approaches have been shunned for their daunting complexity and high-performance parallel computation requirements. This situation now seems to be changing. In this talk, we briefly review recent approaches towards 3D realistic voice simulation that unify, at least to some extent, some of the involved physical fields. Remaining challenges will be highlighted.


GIPSA-lab, 11 rue des Mathématiques, Grenoble Campus BP46, F-38402 SAINT MARTIN D'HERES CEDEX - 33 (0)4 76 82 71 31