A Bayesian approach to source separation

  • Mohammad-Djafari A
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Source separation is one of signal processing's main emerging domains. Many tech- niques such as maximum likelihood (ML), Infomax, cumulant matching, estimating function, etc. have been used to address this difficult problem. Unfortunately, up to now, many of these methods could not account completely for noise on the data, for different numbers of sources and sensors, for lack of spatial independence and for time correlation of the sources. Recently, the Bayesian approach has been used to push farther these limitations of the conventional methods. This paper proposes a unifying approach to source separation based on Bayesian estimation. We first show that this approach gives the possibility to explain easily the major known techniques in source separation as special cases. Then we propose new methods based on maximum a posteriori (MAP) estimation, either to estimate directly the sources, or the mixing matrices or even both. INTRODUCTION

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  • A. Mohammad-Djafari

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