Method and system for on-line blind source separation

An apparatus for separating a plurality of mixed signals into a plurality of component signals comprising:

• means for producing a plurality of discrete Fourier transform (DFT) values corresponding to frequency components of an input segment of said mixed signals;
• means for updating cross correlation estimation matrices using said DFT values;
• a cost-function minimization processor for computing an update value for a plurality of filter coefficients for a finite impulse response (FIR) filter using said cross correlation estimation values;
• and
• an FIR filter having said updated filter coefficients to separate said mixed signals into one or more component signals.

A computer readable storage medium containing a program that, when executed upon a general purpose computer system, causes said general purpose computer system to become a specific purpose computer system that performs a method for separating a plurality of mixed signals into a plurality of component signals comprising the steps of:

• (a) producing a plurality of discrete Fourier transform (DFT) values corresponding to frequency components of an input segment of said mixed signals;
• (b) updating cross correlation estimation matrices using said DFT values;
• (c) computing, using a cost-function minimization process, an update value for a plurality of filter coefficients for a finite impulse response (FIR) filter using said cross correlation estimation values;
• (d) filtering said mixed signals using said FIR filter having said updated filter coefficients to separate said mixed signals into one or more component signals;
• and
• (e) iteratively repeating steps (a), (b), (c) and (d) for successive input segments of said mixed signal.