The decay time

What's the decay time? I set the D input of the ADSR - Env module to 0 (1 ms) but the signal doesn't go from the peak to 0 in 1 ms... Thanks. Antonio

 

Read "The Maths Sticky" thread at the top of the forum, I have a post in there about envelope times.

- Chris

 

i am just working on new envelope modules in core. The ADSR module is very (!) tricky constructed (cookiemonster (Gerald List) and i have analysed it last weekend five hours) and there is no more secret now.
The decay time is as CList mentioned endless in the sence of reaching sustain level. The decay algorithm of the ADSR core cell reaches 1/8 of the difference between the velocity level and the sustain level in the choosen decay "time".
I am working on another time management. The new algorithm calculates the factor of an exponential function which decreases from 101% down to 1% within the decay time. On the output i have only to subtract 1% and that's it.
The picture demonstrates an example of the new algorithm: the level decreases from 1 to sustain level 0.5 in 10 seconds (R=80). I have choosen here the release phase to start the algorithm. The grid steps of the audio table are normed to one second.
I have added another picture with an exponential attack phase.

 

It would be great if there could be some control over the sustain time like in the Access Virus envelopes. I have looked endlessly in the Core ADSR but I don't understand it and would not know how to mod it for that.

 

I forget how the virus env. works. Is that basically a hold time for an ADHR?

CList

 

let me hear your suggestions. I am working on several envelope core modules.
NIs module is mathematically not perfect but there are several interesting tricks mainly using bit-logic and common memories.
The nomenclature of inputs, outputs, macros and memories is terrible and mistakable.

my road map is:

• D (decay)
• AD (attack-decay)
• AR (attack-release)
• ADSR
• ...

every phase with negative, positive curvature and linear curve and end-of-phase clocks.

 

Its a slope. I don't really know how to describe it in a tech sense but I can certainly hear it when I use the virus. I'll hook it up latter and make some samples.

This is the description from the manual, they are more likely to describe it better then I.

 

Ah, so the sustain phase is a linear ramp based on that "slope" value and some time constant. Is there a 5th knob for the ADSR for setting that slope value? (ADS Slope R)

Note that from the picture and the way it's described (as linear);
if you have a "sustain slope" of -10, the sustain will go to 0 sooner if the sustain level is low than when it's high (as opposed to the exponential release phase which will always take the same amount of time to decay regardless of the sustain level). This also means that the output can actually go to 0, which the release will take a really long time to do.

It should be fairly easy to add it as a new phase to the core existing adsr (once you understand the existing ADSR), I'd do it now, but I have to run...

Cheers,
C

 

adding a sustain slope is nearly like using the attack phase with actual output level and negativ "b" (see latch output). Latch output "a" has to be set to 1.

 

Any chance you could share this, or explain how to implement?

The Zobel envelope from let's say "Cloud#9" would be greatly enhanced with this. I use those very often.

 

i am working on it and i will share when it is done.

 

Wow, that's extremely generous of you to share your work!

The envelopes are one of the weakest links in Reaktor.
The graphic you posted looks like it's just the thing to get a more natural and modern response from some of my favorite instruments.

Greatly appreciated!

 

explaining is very difficult

second attachment is the formula for a decraesing decay function (positive curvature).
v is velocityOn, D are the sample ticks for the decay time, t is the momentan sample tick. The silly exponential basis is build in the macro x (first attachment).

 

Very nice to see it demonstrated so clearly.
I'll have to study this tonight.

Are you planning to offer adjustable slope curvature?

 

thanks for all the info......as i hide in the corners.

 

It is possible - but be patient it is not a project of hours, days or weeks because i'll publish only when it is 100% bugfree.
In the meantime you can use the normal ADSR from primary or Core. The Core-macro is very flexible: f.i. try modulating the time coefficients or modulating the gate sensitivity (not only 0 or 1).
Or download the REAL TIME ENVELOPE or the PROGRAMMABLE ENVELOPE

 

That positive curve looks exactly as I was hoping.
Can't wait to see it billowing in and out per "x".

I'm saving up my foolish questions for later

Good work Mr. Krass!

 

the first picture shows a negative curve ;-) (first non foolish question)
but ask - it keeps me on the road.

btw: road - think about the envelope function like a road. You are driving through the function (envelope) from left to right (looking like a bird). If you have to drive right then it is a negative curve if you are driving left it is a positive curve.

 

Ah, I see. Thanks for clarifying.
The nomenclature is slightly counter-intuitive to me.

From now on I'll try to visualize the envelope from a different perspective. Need to walk inside of it. See from it's eyes.
From that perspective I can see how "positive" would denote a force, or tension entering into-acting upon-compacting it. "Negative" can be imagined as a relaxation of this pressure-allowing it to relax-expand.


If it were a lung-"positive" would be during the contraction phase?
Exhalation, or Inhalation?

Ok, now I've thoroughly confused myself.

Anybody ever make a lung oscillator? J/K