Compact representations of the articulatory-to-acoustic mapping
Blaise Potard, Yves Laprié · 2007
Articulatory codebooks are very often used to represent the articulatory-to-acoustic mapping. They thus need to be com-pact while offering a very good acoustic precision. This paper presents a method of articulatory codebook construction more general than that of Ouni [1] in the sense that the articulatory-to-acoustic mapping is approximated by multivariable polyno-mials. The second major contribution concerns the subdivision process which finds out the most efficient subdivision, i.e. that which minimizes the size of the codebook while guarantying a very good acoustic precision. Experiments carried out show that the size of the codebook can be divided by a factor of 20, and simultaneously, the acous-tic precision can improved by a factor of 2 by using second order polynomials together with this new construction strategy. Index Terms: acoustic-to-articulatory inversion, codebook, polynomial interpolation.