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      Modeling the articulatory space using a hypercube codebook for acoustic-to-articulatory inversion.

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          Abstract

          Acoustic-to-articulatory inversion is a difficult problem mainly because of the nonlinearity between the articulatory and acoustic spaces and the nonuniqueness of this relationship. To resolve this problem, we have developed an inversion method that provides a complete description of the possible solutions without excessive constraints and retrieves realistic temporal dynamics of the vocal tract shapes. We present an adaptive sampling algorithm to ensure that the acoustical resolution is almost independent of the region in the articulatory space under consideration. This leads to a codebook that is organized in the form of a hierarchy of hypercubes, and ensures that, within each hypercube, the articulatory-to-acoustic mapping can be approximated by means of a linear transform. The inversion procedure retrieves articulatory vectors corresponding to acoustic entries from the hypercube codebook. A nonlinear smoothing algorithm together with a regularization technique is then used to recover the best articulatory trajectory. The inversion ensures that inverse articulatory parameters generate original formant trajectories with high precision and a realistic sequence of the vocal tract shapes.

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          Author and article information

          Journal
          J Acoust Soc Am
          The Journal of the Acoustical Society of America
          Acoustical Society of America (ASA)
          0001-4966
          0001-4966
          Jul 2005
          : 118
          : 1
          Affiliations
          [1 ] Perceptual Science Laboratory, University of California Santa Cruz, Santa Cruz, California 95064, USA. slim@fuzzy.ucsc.edu
          Article
          10.1121/1.1921448
          16119364
          daec59ff-da9d-422f-9586-b083b8a9dad2
          History

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