[PD] Compressor for vanilla pd??
Andy Farnell
padawan12 at obiwannabe.co.uk
Tue Dec 2 19:46:58 CET 2008
On Tue, 2 Dec 2008 17:59:42 +0000
"Solen Music" <solenpuredata at googlemail.com> wrote:
> Does anybody know if there's any theory about soft knees, program
> related releases, etc., so as to maybe emulate opto style compression
> or other types of esoteric compression?
Putting a low pass filter of a few Hz into the side chain can provide
an attack. To soften the knee you need a smooth transfer function that
multiplies the gain curve (so its a sort of second order thing). Places
a curve between the linear 1:1 gain and reduced gain 1:n lines.
Opto is a feed forward style, and IIRC the photoresistor (ORP12 CdS2)
has a slight persistence so it responds sluggishly to changes.
I'm not sure if that's actually due to the slow cooling of a filament
lamp some designs use one, but others use a LED which seems
to be instant on/off)
Anyway, you could model feed-forward in Pd using a small delay buffer
and a lowpass filter.
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