DocumentCode :
323803
Title :
A variational approach for estimating vocal tract shapes from the speech signal
Author :
Laprie, Yves ; Mathieu, Bruno
Author_Institution :
LORIA, Vandoeuvre-les-Nancy, France
Volume :
2
fYear :
1998
fDate :
12-15 May 1998
Firstpage :
929
Abstract :
This paper present´s a novel approach to recovering articulatory trajectories from the speech signal using a variational calculus method and Maeda´s (1979) articulatory model. The acoustic-to-articulatory mapping is generally assessed by a double criterion: the acoustic proximity of results to acoustic data and the smoothness of articulatory trajectories. Most of the existing methods are unable to exploit the two criteria simultaneously or at least at the same level. On the other hand, our variational calculus approach combines the two criteria simultaneously and ensures the global acoustic and articulatory consistency without further optimization. This method gives rise to an iterative process which optimizes a startup solution given by an improved lookup algorithm. Codebooks generated with an articulatory model show nonuniform sampling of the acoustic space due to nonlinearities of the acoustic-to-articulatory mapping. We therefore designed an improved lookup algorithm building realistic articulatory trajectories which are not necessarily defined throughout the speech signal
Keywords :
acoustic signal processing; iterative methods; optimisation; parameter estimation; speech coding; table lookup; variational techniques; Maeda´s articulatory model; acoustic data; acoustic proximity; acoustic space; acoustic-to-articulatory mapping; articulatory model; articulatory trajectories recovery; articulatory trajectories smoothness; codebooks; global acoustic consistency; global articulatory consistency; iterative process; lookup algorithm; nonlinearities; nonuniform sampling; speech coding; speech signal; startup solution; variational calculus method; vocal tract shapes estimation; Calculus; Iterative algorithms; Iterative methods; Nonlinear acoustics; Nonuniform sampling; Optimization methods; Shape; Signal design; Speech; Trajectory;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
ISSN :
1520-6149
Print_ISBN :
0-7803-4428-6
Type :
conf
DOI :
10.1109/ICASSP.1998.675418
Filename :
675418
Link To Document :
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