Reduced-delay subband signal processing system and method

A system for signal processing comprising:

• a sub-band analysis system configured to receive a time domain input signal and to generate a plurality of coarse filtered sub-band output signals in the frequency domain;
• a plurality of fine spectral decomposition systems, each configured to receive one of the coarse filtered sub-band outputs and to generate a plurality of frequency domain sub-band output signals;
• a plurality of filter design systems, each configured to receive one of the plurality of frequency domain sub-band signals outputs and to generate a frequency domain sub-band filter;
• and
• a plurality of frequency to time domain converters, each configured to receive one of the frequency domain sub-band filters and to generate a time domain sub-band filter.

A system for signal processing comprising:

• a sub-band analysis system configured to receive an input signal and to generate a plurality of coarse filtered sub-band output signals in the frequency domain;
• a plurality of buffers, each configured to receive one of the coarse filtered sub-band output signals and to store the coarse filtered sub-band output;
• a plurality of fine spectral decomposition systems, each configured to receive one of the coarse filtered sub-band outputs as a time domain signal and to generate a frequency domain sub-band output;
• a plurality of filter design systems, each configured to receive one of the frequency domain sub-band outputs and to generate a frequency domain sub-band filter;
• and
• a plurality of frequency to time domain converters, each configured to receive one of the frequency domain sub-band filters and to generate a time domain sub-band filter;
• wherein the sub-band analysis system comprises a uniform discrete Fourier transform filter bank;
• wherein the plurality of coarse filters each comprise an echo cancellation system;
• wherein each of the plurality of fine spectral decomposition systems comprises a windowed fast Fourier transform system;
• wherein each of the plurality of filter design systems comprises a beam forming system;
• and
• wherein each of the time domain sub-band filters is applied to one of the stored coarse filtered sub-band outputs to generate an output, and the outputs are combined.