Patent ID: 8285772

Claim:
A finite impulse response (FIR) filtering device, comprising: a first designated FIR filter having a first fixed number of taps and being adapted to filter a first signal; a second designated FIR filter having a second fixed number of taps and being adapted to filter a second signal different from the first signal; a switching circuit being coupled to the first and the second designated FIR filters, respectively; an allocation FIR filter having a third fixed number of taps; an estimation circuit for estimating effects of filtering the first and second signals according to one or more parameters related to a number of taps, so as to generate one or more estimation results; and a control circuit, in response to the one or more estimation results, for coupling M tap/taps of the allocation FIR filter to the first designated FIR filter through controlling the switching circuit, and coupling N tap/taps of the allocation FIR filter to the second designated FIR filter through controlling the switching circuit, where M and N are integers equal to or greater than zero.