[PD] could vanilla borrow iemlib's hi pass filter recipe?

katja katjavetter at gmail.com
Fri Oct 14 23:51:26 CEST 2016

In pd 0.47.1 [hip~] is still not perfect. Attenuation at cutoff is not
constant over the frequency range: -6 dB with cutoff=SR/8, -3 dB with
cutoff=SR/4, 0 DB with cutoff=SR/2. In contrast, iemlib's [hp1~] has
-3 dB at cutoff consistently.

Could vanilla pd implement iemlib's hipass filter recipe? I don't know
if the license also covers the math. Documentation in
https://git.iem.at/pd/iemlib/tree/master points to external literature
for part of the math (bilinear transform). I've implemented the recipe
with vanilla objects for comparison, see attached.

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