[sdiy] Idea: oddly timed envelope gen thingy

[Peter Grenader]

Barry Kleinwrote:

Barry,


Yes.

In summary and put more clearly than I did the first time:

You have a envelope generator whose duration is determined only by the
settings of the attack and decay pots, and not the on-time of the trigger or
gate triggering it.

That's one output

You have another output that gives a constant rise, which is phase locked so
to speak to last exactly as long as the attack and decay settings.  So it
starts rising when the incoming trigger is received and stops rising and
falls to zero when the duration cycle is completed (envelope goes back to
ground).

that is the second output.

If the voltage plateau is reached before the end of the cycle, so be it,
that will work - as long as it sustains until the end of the decay cycle.





> So are you saying you want a VC "rise" output that goes from say 0v to 10v
> in the amount of time it takes for the AR envelope to complete?
> 
> Barry
> 
> 
> -----Original Message-----
> From: Peter Grenader [mailto:petergrenader at mksound.com]
> Sent: Thursday, March 06, 2003 6:25 AM
> To: Synth-Diy
> Subject: [sdiy] Idea: oddly timed envelope gen thingy
> 
> 
> 
> Excuse the rather complicated title of this post.  I prersent to you the
> first annual SDIY design challenge competition.  First one who does it gets
> something.
> 
> .....wondering if anyone has ever made anything that does what I'm wishing
> for
> right now:
> 
> A Beer Generator.  You put a pulse in, and....
> 
> kidding.
> 
> What I am wanting is an envelope that has two outputs.  One just boilerplate
> AR, and the other which is attack only that is exactly timed so that
> whatever length is dialed into the combined attack and decay, the A only
> output will give an attack which last exactly as long as that combined A/R
> time constant.
> 
> What I am wanting this for is (I think) fairly obvious.  You have an
> amplitude envelope gating a sound and you want that sound to be swept
> through a filter that is constantly rising, even when its amplitude is
> fading out.  This is easy with careful settings of two envelopes, but how
> about when you want to vc the overall length of the amp envelope so each
> sounding is slightly different.  then this set-up become complicated so it
> will work right in every instance.  t'would be nice if there was a jack that
> just gave you that constant rise.
> 
> I think it would be (fairly) easy.  The output of the AR envelope internally
> wired through a comparator, with a lag at it's output, right?  Yes, it could
> be done using tow modules that do these functions- but why tie them up for
> this I say?
> 
> somebody should work on this (for me).  Jim Patchell, Magnus and JH are
> great candidates for this as their designs are terrific.
> 
> guys?
> 
> seriously - has anyone ever done this?
> 
> lemme know and thanks,
> 
> Peter
> 
> 
> 
>