A Variational EM Algorithm for the Separation of Time-Varying Convolutive Audio Mixtures

作者：Kounades Bastian Dionyssos^*; Girin Laurent; Alameda Pineda Xavier; Gannot Sharon; Horaud Radu

来源：IEEE/ACM Transactions on Audio Speech and Language Processing, 2016, 24(8): 1408-1423.

DOI：10.1109/TASLP.2016.2554286

• Audio source separation
• Kalman smoother
• moving sources
• time-varying mixing filters
• variational EM

This paper addresses the problem of separating audio sources from time-varying convolutive mixtures. We propose a probabilistic framework based on the local complex-Gaussian model combined with non-negative matrix factorization. The time-varying mixing filters are modeled by a continuous temporal stochastic process. We present a variational expectation-maximization (VEM) algorithm that employs a Kalman smoother to estimate the time-varying mixing matrix, and that jointly estimate the source parameters. The sound sources are then separated by Wiener filters constructed with the estimators provided by the VEM algorithm. Extensive experiments on simulated data show that the proposed method outperforms a blockwise version of a state-of-the-art baseline method.

• 出版日期2016-8
• 单位INRIA