Séparation de sources audio en milieu réverbérant : Factorisation en matrices non-négatives et représentation temporelle du mélange convolutif

This paper addresses the problem of multichannel audio source separation in under-determined reverberant mixtures. We target a semi-blind scenario assuming that the mixing lters are known. The proposed method consists in working directly with the time-domain mixture signals. This approach makes it possible to accurately represent the convolutive mixing process, it is therefore suitable for the separation of highly reverberant mixtures. The source signals are represented in the modi ed discrete cosine transform domain with a Gaussian model based on non-negative matrix factorization (NMF). Source inference is based on a variational expectation-maximization algorithm. We experimentally show the advantage of using a time-domain representation of the convolutive mixture and a source model based on NMF.