For seismological application, I am playing with an elliptical filter, and once I have both sets of feedback and feedforward co-efficients, how do I make it so that I can plot the frequency response of the system? Can I also use the same technique to make the frequency response for a bessel?
I know that I can take the FFT for an FIR filter and I can get its transfer function, but for a non-FIR, is there a way also using the FFT?