Digital Filter Library for Signal Processing.
This library consists of easy-to-use Butterworth first & second order digital filters. You can calculate cutoff parameters with:
wc = 2 * pi * (desired cutoff in Hz) / (sample rate in Hz) =
(desired cutoff in rad/sec) * (sample period in sec)
Internally cutoff parameters are prewarped for correct operation. All New*() functions
return nil if parameters are invalid.
Also, butter uses semantic versioning.
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