[PD] best non linear envelope design?

[Alexandre Torres Porres]

yeah, both creb/eadsr~ and bsaylor/aenv~ seem to use a one pole filter
design, even though both generate slightly different shapes.

Em sáb, 13 de jul de 2019 às 20:40, Alexandre Torres Porres <
porres at gmail.com> escreveu:

>
>
> Em sáb, 13 de jul de 2019 às 05:40, Christof Ressi <christof.ressi at 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
>
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