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Filter Analyzer Update

April 10, 2012
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Just a quick note to mention that I’ve updated the EzFFT Filter Analyzer in the Downloads section. I got sick of the white noise signal being so… noisy. At low frequencies in particular the signal would be jumping around so much that it would be hard to read the graph properly. So, I attempted to make a waveform representing all frequencies that was a little more stable over time to get a clearer picture of my filters.

The best method I found was to simply use an iFFT module and feed it amplitude and phase inputs to set up a signal that has the same amplitude at all frequencies. I use this ensemble for designing and testing filters, as it gives you an immediate answer to whether you’re doing it right. I hope some others find it useful too.

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3 Comments leave one →
  1. errorsmith permalink
    May 12, 2012 3:28 pm

    hi,
    “and feed it amplitude and phase inputs to set up a signal that has the same amplitude at all frequencies” an impulse osc has this property. but the phase and frequency of it needs to be in line with the ezfft windowing.
    here is the ezfft analyzer edit that i use for this purpose.
    http://www.errorsmith.de/analyzer.ens
    maybe it works as good as yours but is cpu friendlier.

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