Em sáb, 13 de jul de 2019 às 05:40, Christof Ressi <christof.ressi@gmx.at> escreveu:
Hey,
 
> I actually know of two other adsr envelopes out there for Pd, both non linear, they are: bsaylor/aenv~ and creb/eadsr~ - both are hardcoded.
 
attached you'll find my own personal envelope generator (cadsr~) which allows you to set the shape individually for each segments.

cool, but I only see 1 exponential parameter for all lines.
 
Exponential segments take another argument to control the shape ( >0 fast rise, <0 slow rise).

and its minimum value is "1".


For a "natural" envelope generator, like those found in analog synthesizers, you can use a 1-pole lowpass filter and change the frequency for each segment to emulate the behavior of a capacitor.

I see, makes total sense.
 
with 5 time constants, the envelope generator will reach 99.3% of the target value. Note that the target value is always approached asymptotically and - at least in theory - never fully reached.

I see, so that's what asymptotic means then. The bsaylor/aenv~ object says it's asymtotic, so I bet it uses the same 1-pole design (I'm yet to check the code). Anyway, I was able to make envgen~ get to a pretty close curvature to your patch with a time value of "5". I used an exponential value of 4 and that did fit reasonably well. I don't thin the difference is perceivable in any significant way. So I guess I'm going with that approach to the design of my hardcoded adsr~ exponential setting.

Thanks