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Audiovisual speech inversion by switching dynamical modeling Governed by a Hidden Markov Process
KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Speech Communication and Technology. KTH, School of Computer Science and Communication (CSC), Centres, Centre for Speech Technology, CTT.
NTU, Athens, Greece.
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2008 (English)In: Proceedings of EUSIPCO, 2008Conference paper (Refereed)
Abstract [en]

We propose a unified framework to recover articulation from audiovisual speech. The nonlinear audiovisual-to-articulatory mapping is modeled by means of a switching linear dynamical system. Switching is governed by a state sequence determined via a Hidden Markov Model alignment process. Mel Frequency Cepstral Coefficients are extracted from audio while visual analysis is performed using Active Appearance Models. The articulatory state is represented by the coordinates of points on important articulators, e.g., tongue and lips. To evaluate our inversion approach, instead of just using the conventional correlation coefficients and root mean squared errors, we introduce a novel evaluation scheme that is more specific to the inversion problem. Prediction errors in the positions of the articulators are weighted differently depending on their relevant importance in the production of the corresponding sound. The applied weights are determined by an articulatory classification analysis using Support Vector Machines with a radial basis function kernel. Experiments are conducted in the audiovisual-articulatory MOCHA database.

Place, publisher, year, edition, pages
, European Signal Processing Conference, ISSN 22195491
Keyword [en]
Active appearance models, Audio-visual speech, Classification analysis, Correlation coefficient, Dynamical modeling, Evaluation scheme, Hidden Markov process, Inversion problems, Mel-frequency cepstral coefficients, Prediction errors, Radial basis functions, Root mean squared errors, State sequences, Switching linear dynamical systems, Unified framework, Visual analysis
National Category
Computer Science Language Technology (Computational Linguistics)
URN: urn:nbn:se:kth:diva-52053ScopusID: 2-s2.0-84863731362OAI: diva2:465347
16th European Signal Processing Conference, EUSIPCO 2008, Lausanne, Switzerland, 25-29 August 2008

QC 20141013

Available from: 2011-12-14 Created: 2011-12-14 Last updated: 2015-11-11Bibliographically approved

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