[sdiy] ADSR Trigger/Retrigger behaviour

rsdio at audiobanshee.com rsdio at audiobanshee.com
Mon Jun 30 05:42:34 CEST 2014


On Jun 28, 2014, at 1:25 PM, rburnett at richieburnett.co.uk wrote:
> To put it another way, the decay phase is clearly defined since it decays exponentially from the end of the attack level down to wherever the sustain level is set to.  Similarly the release phase decays exponentially from whatever the sustain level was set to down to zero or silence.  Both the decay and release phases have defined start and end points and defined time-constants, but the end-point for the attack phase seems less well defined.  For example, it might typically consist of charging a capacitor from 0V towards 10V with the classic exponential charging waveform, but it theoretically takes forever to get to 10V.  So at some point we have to say "that's enough waiting" and switch over to the decay phase of the envelope.
Theoretically, it also takes forever to get to 0 V, so the Decay and Release phases are not any more defined than the Attack. The one difference is that no switching has to occur at the end of Decay or Release, so it doesn't really matter how long it actually takes.

Brian Willoughby




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