I've got a set of measured data (amplitude and phase responses) of a filter. And I want to normalize its gain to be unit (equal to 1) for further processing. I know that we can convert to time-domain coefficients and normalize by dividing to its sum of all coefficients.
The question is could we normalize the gain using frequency-domain results (amplitude)? Because converting to time-domain introduces more computational complexity (employ iFFT) which I don't want.
Thank you very much.