moorepants/DynamicistToolKit — pull request #21 by moorepants (2014-05-27 19:36:46+00:00)
Title: Fixed incorrect normalized cutoff frequency computation in butterworth.

The nomarlized cutoff frequency for Butterworth filters should be:

Wn = cutoff / (0.5 * samplerate)

But I was using:

Wn = cutoff / 2.0 / samplerate