Patent ID: 8131541

Claim:
A method of noise reduction comprising: using analysis filter banks to decompose each of a first and a second input signal into a plurality of subbands, the first and second input signals being received by two closely spaced microphones; applying an adaptive decorrelation filter in each subband for each of the first and second signals to generate a plurality of filtered subband signals from each of the first and second input signals; adapting the filter in each subband for each of the input signals based on a step-size function associated with the subband and the input signal, wherein a direction of the step-size function associated with a subband and one of the first and second input signals is adjusted according to a phase of a cross-correlation between an input subband signal from the other of the first and second input signals and a filtered subband signal from said other of the first and second input signals; and using a synthesis filter bank to combine said plurality of filtered subband signals from the first input signal to generate a restored fullband signal.