Patent ID: 6885750

Claim:
A multi-channel filter comprising: S inputs for receiving S input signals (x 1 . . . x S ); at least S filters coupled to the S inputs for filtering the input signals (x 1 . . . x S ) or auxiliary signals (y 1 . . . y S ) derived therefrom; a signal combiner for combining the filtered signals into an output signal (ê), with S being the number of channels of the multi-channel filter; a further signal combiner coupled in between at least part of the inputs and at least part of the filters, the further signal combiner combining at least part of the input signals (x 1 . . . x S ) into at least one auxiliary signal (y 1 . . . y S ), wherein at least one of the filters has a filter length which is substantially larger than the filter lengths of the other filters.