Inversion acoustique articulatoire à partir de coefficients cepstraux

Abstract : The acoustic-to-articulatory inversion of speech consist in the recovery of the vocal tract shape from the speech signal. This problem is tackled with an analysis-by-synthesis method depending on a physical model of speech production controlled by a small number of parameters describing the vocal tract shape: the jaw opening, the shape and the position of the tongue and the position of lips and larynx. In order to approach the geometry of the speaker, the articulatory model is built with articulatory contours from cineradiographic images of the sagittal view of the vocal tract. This articulatory synthesizer allows us to create a table made up with couples associating a articulatory vector with the corresponding acoustic vector. The formants (resonance frequency of the vocal tract shape) are not used as acoustic vector because their extraction is not always reliable causing errors during inversion. The cepstral coefficients are used as acoustic vector. Moreover, the source effect and the mismatch between the speaker vocal tract and the articulatory model are considered explicitly comparing the natural spectrum with those produced by the synthesizer because we have the both signals
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Julie Busset. Inversion acoustique articulatoire à partir de coefficients cepstraux. Autre [cs.OH]. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0027⟩. ⟨tel-01749416⟩

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