[PD] types of distortion
Ben Saylor
bensaylor at fastmail.fm
Tue Jul 20 18:08:49 CEST 2004
For different kinds of soft clipping, also try:
[expr~ 1.5 * $v1 - 0.5 * pow($v1, 3)]
[expr~ tanh($v1)]
[expr~ $v1 / (abs($v1) + 1)]
I wrote the zhzxh~ external (in CVS), which produces very noisy
distortion using a very simple algorithm which isn't waveshaping; I'm
not sure how you'd classify it:
while (n--) {
f = *(in++);
if (lastval < f)
*out = lastval + delta;
else
*out = lastval - delta;
lastval = *(out++);
}
Changing delta alters the character of the distortion.
Ben
On Tuesday 20 July 2004 05:48 pm, pix wrote:
> linear remapping is not so hard if you can define your remapping
> mathematically. i'm a bit of a fan of this function (which i'll
> write as an expr for handy use).
>
> [expr~ 2/(1+pow($f2,-$f1))-1]
>
> your input goes in the left, the signal on the right is a control
> (sensible values >1).
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