Bertrand Rivet
GIPSALab, CNRSUMR 5216, Grenoble INP
Session JEP poster P1 Lundi 9 Juin  16h00 18h00

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Séparation de sources nonstationnaires par la parcimonie pour un mélange linéaire instantané
 Bertrand Rivet ( GIPSALab, CNRSUMR 5216, Grenoble INP)
 Résumé : We propose a method to estimate nonstationnary sources with non activity periods in a determined linear instantaneous mixture. Our method is based on the assumption that in some unknown temporal periods speech signals are inactive leading thus to an overdetermined mixture. Such silence periods allow to estimate the rows of the demixing matrix by a new algorithm called Direction Estimation of Separating Matrix (DESM). The periods of sources inactivity are estimated by a generalized eigen decomposition of covariance matrices of the mixtures, and the separating matrix is then estimated by a kernel principal component analysis. Experiments are provided with determined mixtures, and shown to be efficient.
 article