Method and device for separating signals by minimum variance spatial filtering under linear constraint

A device for separating, at least in part, one or more particular digital audio source signals contained in a multichannel mixed digital audio signal, the mixed signal being obtained by mixing a plurality of digital audio source signals and including representative values of the particular source signal(s), the device comprising:

• determination means for determining the modulus of the amplitude or the normalized power of the particular source signal(s) from the representative values in the time-frequency plane of said particular source signal(s) contained in the mixed signal;
• and
• a linearly constrained minimum variance spatial filter adapted to isolate, at least in part, each particular source signal from the mixed signal, said filter being based on the distribution of said particular source signal between at least two channels of the mixed signal, and the modulus of the amplitude or the normalized power of said particular source signal being used as a linear constraint.