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Frequency Response Curves with EzFFT

February 24, 2012
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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.

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3 Comments leave one →
  1. meter maid permalink
    February 25, 2012 12:17 am

    It would be interesting to read more about your adventures with filters and maybe see some examples. There are few public core filters around.

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  1. Basic Bi-quad Filters in Core « salamanderangram

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