[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;
                        *out = lastval - delta;
                lastval = *(out++);

Changing delta alters the character of the distortion.


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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