Blind Source Separation for Non-Stationary Mixing

Authors:
Richard Everson;Stephen Roberts
Affiliations:
Department of Computer Science, University of Exeter, Exeter, UK;Department of Engineering Science, University of Oxford, Oxford, UK
Venue:
Journal of VLSI Signal Processing Systems
Year:
2000

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Abstract

Blind source separation attempts to recover independent sources which have been linearly mixed to produce observations. We consider blind source separation with non-stationary mixing, but stationary sources. The linear mixing of the independent sources is modelled as evolving according to a Markov process, and a method for tracking the mixing and simultaneously inferring the sources is presented. Observational noise is included in the model. The technique may be used for online filtering or retrospective smoothing. The tracking of mixtures of temporally correlated is examined and sampling from within a sliding window is shown to be effective for destroying temporal correlations. The method is illustrated with numerical examples.