Discrete Time Apps – Sampled RC filters
By appropriately sampling the time domain response of the RC filter, one can easily find the coefficients to
make an approximate RC filter (FIR structure). The approximation stems from the truncation of the
impulse response. If we define the length of the filter to be N and the sample rate to be Fs , then we find
our raised cosine filter’s coefficients to be given by ( ) ( ) ( ) RC n = h1 n × h2 n where: