Uncontrolled Manifolds in Vowel Production: Assessment with a Biomechanical Model of the Tongue

Andrew Szabados 1 Pascal Perrier 1, *
* Auteur correspondant
1 GIPSA-PCMD - PCMD
GIPSA-DPC - Département Parole et Cognition
Abstract : Motor equivalence is a key feature of speech motor control, since speakers must constantly adapt to various phonetic contexts and speaking conditions. The Uncontrolled Manifold (UCM) idea offers a theoretical framework for considering motor equivalence. In this framework coordination among motor control variables is separated into two subspaces, one in which changes in control variables modify the acoustic output and another one in which these changes do not influence the output. Our work develops this concept for speech production using a 2D biomechanical model of the tongue, coupled with a jaw and lip model, for vowel production. We first propose a representation of the linearized UCM based on orthogonal projection matrices. Next we characterize the UCMs of various vocal tract configurations of the 10 French oral vowels using their perturbation responses. We then investigate whether these UCMs describe phonetic classes like phonemes, front/back vowels, rounded/unrounded vowels, or whether they significantly vary across representatives of these different classes. We found they clearly differ between rounded and unrounded vowels, but are quite similar within each category. This suggests that similar motor equivalence strategies can be implemented within each of these classes and that UCMs provide a valid characterization of an equivalence strategy.
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Communication dans un congrès
Nelson Morgan 17th Annual Conference of the International Speech Communication Association (Interspeech 2016), Sep 2016, San Francisco, United States. Proceedings of Interspeech 2016, 2016, pp.3579 - 3583, 2016, <10.21437/Interspeech.2016-1579>
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https://hal.archives-ouvertes.fr/hal-01390160
Contributeur : Pascal Perrier <>
Soumis le : lundi 31 octobre 2016 - 20:23:05
Dernière modification le : vendredi 2 décembre 2016 - 14:33:16

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Andrew Szabados, Pascal Perrier. Uncontrolled Manifolds in Vowel Production: Assessment with a Biomechanical Model of the Tongue. Nelson Morgan 17th Annual Conference of the International Speech Communication Association (Interspeech 2016), Sep 2016, San Francisco, United States. Proceedings of Interspeech 2016, 2016, pp.3579 - 3583, 2016, <10.21437/Interspeech.2016-1579>. <hal-01390160>

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