Frequency Response Curves with EzFFT
February 24, 2012
Recently I’ve been toying around with making simple bi-quad filters in Reaktor. In doing so I realized a simple method for measuring the frequency response curve for a given filter: simply feed a white noise signal thru the filter, then chart the FFT for the signal. Since white noise contains (statistically speaking) all frequencies, you can get a pretty good idea of what gets filtered out.
Making an ensemble out of this is an extremely quick modification of the Ezfft Analyzer that comes with Ezfft. Download it here.
It would be interesting to read more about your adventures with filters and maybe see some examples. There are few public core filters around.
I’ll clean up and post an example of a multi-mode biquad filter sometime this weekend.