Source separation without explicit decorrelation

The contrast approach has become classical for separating independent sources. It involves whitening (with decorrelation) as a pre-processing step. Here we propose a new contrast applicable to correlated signals, as long as they have unit power. The corresponding system involves output Automatic Gain Controls (AGC). An adaptive contrast maximization is proposed. Its achievements are shown to outperform the adaptive implementation of the classical pre-whitened contrast.