Patent ID: 6965640

Claim:
A filter adaptation unit suitable for producing a set of filter coefficients, said filter adaptation unit comprising: a) a first input for receiving a sequence of samples of a first signal; b) a second input for receiving a sequence of samples of a second signal, the second signal including a certain component which is correlated to the first signal; c) a coefficient generation unit operative for generating a first set of filter coefficients at least in part on the basis of said first and second signals, the first set of filter coefficients being such that when the first set of filter coefficients is applied by a filter on the first signal, a first estimate of the certain component in the second signal is generated; d) a performance evaluation unit operative for generating a set of performance data elements for a filter using the first set of filter coefficients, each performance data element being associated to a respective frequency band selected from a set of frequency bands; e) a noise reduction unit operative for: i. generating a set of correction signals, said set of correction signal including a correction signal for each frequency band where the associated performance data element is indicative of an unsatisfactory performance; ii. generating a second set of filter coefficients at least in part on the basis of: (a) said first signal; (b) said second signal; and (c) the set of correction signals; the second set of filter coefficients being such that when the second set of filter coefficients is applied by a filter on the first signal, a second estimate of the certain component in the second signal is generated; f) an output for releasing a signal indicative of the second set of filter coefficients in a format suitable for use by a filter.