An apparatus and method for generating finite impulse response (FIR) filter coefficients
are presented. The apparatus includes an address generator that multiplies a desired
cutoff frequency f by an integer n to generate an address, a first look-up table
that generates a sine function value of the address, a divider that divides the
sine function value by n*pi, a multiplexer that generates an impulse response function
value by selecting one of a value produced from the divider and 2*f based on an
outside control signal, and a multiplier that multiplies the impulse response function
value by a corresponding window function value to generate an nth filter coefficient
for the FIR filter.
