[sdiy] AHDSR schemo

[Roman]

here:
http://www.sowa.synth.net/poly/adsr.gif
http://www.sowa.synth.net/m_pics/m_addsr.gif
it's very simple, in most ADSR desigs there's comparator of some kind
and it's only a matter of changing it's reference voltage.
Second link is about envelope generator where I wanted a slight touch
of a punch, so I did it by switching attack phase from linear to
exponential. See the result:
http://www.sowa.synth.net/m_pics/addsr_punch.jpg

now tell me what a heck did I mean by "adjutment" and "firther"
I better go to sleep now

Roman

----- Original Message -----
From: "Scott Gravenhorst" <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, March 19, 2004 4:14 PM
Subject: Re: [sdiy] AHDSR schemo


> Hi Roman,
>
> I've not yet seen this design, can you point to an example?
>
> "Roman" <modular at go2.pl> wrote:
> >If the ADSR is with attack level adjutment (I make those kinds only)
> >there's no need for amplifying whole envelope and sustain stays the same.
> >But delaying trip time is also good. If attack is exponential like
resistor
> >charging capacitor, that'll cause bigger attack peak when trip is
delayed.
> >If it's linear like cap charged from current source, one must make sure
> >the source's maximum voltage is at peak level, so it' doesn't raise any
> >firther if trip is delayed.
> >
> >Roman
> >
> >----- Original Message -----
> >From: "Scott Gravenhorst" <music.maker at gte.net>
> >To: <synth-diy at dropmix.xs4all.nl>
> >Sent: Thursday, March 18, 2004 10:43 PM
> >Subject: Re: [sdiy] AHDSR schemo
> >
> >
> >> [my opinion mode]
> >> Though both methods will work, I believe that a one-shot would be the
> >better
> >> way.  The reason is that to use clipping, the ADSR signal has to be
> >variably
> >> amplified.  In doing so, the sustain part of the signal, which is also
a
> >> controllable level, will also be amplified.  Because of this, the
clipping
> >> amplification setting will interact with the sustain level.  With the
one
> >> shot method, no such interaction will occur, regardless of the time
dialed
> >up
> >> for punch.  Jim's method, which I also presented, can do this with only
> >> passive components, a cap, a pot and a diode and can also be applied to

> >> designs I've seen that use a threshhold detector and RS flipflop.
> >> [end]
> >>
> >> "Roman" <modular at go2.pl> wrote:
> >> >just a thought
> >> >take any ADSR, the best would be the kind with adjustable peak level,
> >> >and clip it. Without punch it'd work at normal level and look like
ADSR.
> >> >When punch is activated, peak level wil increase, but output buffer
would
> >> >be clipped at constant level, giving flat top for some time and AHDSR.
> >> >
> >> >Roman
> >> >
> >> >----- Original Message -----
> >> >From: "The Old Crow" <oldcrow at oldcrows.net>
> >> >To: <synth-diy at dropmix.xs4all.nl>
> >> >Sent: Thursday, March 18, 2004 7:13 PM
> >> >Subject: Re: [sdiy] AHDSR schemo
> >> >
> >> >
> >> >>
> >> >>   Seems to me the simplest way to add punch delay is with a small
> >one-shot
> >> >> (series pot, cap to ground, diode clamp to ground to snub the
> >> >> negative-going impulse and perhaps a buffer/inverter gate) in the
logic
> >> >> line that changes state when the attack cycle reaches the point it
> >> >> transistions in the decay.
> >> >>
> >> >> Crow
> >> >> /**/
> >> >>
> >> >
> >>
> >> =========================================================
> >> - Where merit is not rewarded, excellence fades.
> >> - Hydrogen is pointless without solar.
> >> - What good are laws that only lawyers understand?
> >> - The media's credibility should always be questioned.
> >> - The only good terrorist is a dead terrorist.
> >> - Governments do nothing well, save collect taxes.
> >>
> >> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
> >> -- Linux Rex         | RedWebMail by RedStarWare
> >> -- FatMan: home1.gte.net/res0658s/FatMan/
> >> -- NonFatMan: home1.gte.net/res0658s/electronics/
> >> -- Autodidactic Master of Arcane and Hidden Knowledge.
> >>
> >
>
> =========================================================
> - Where merit is not rewarded, excellence fades.
> - Hydrogen is pointless without solar.
> - What good are laws that only lawyers understand?
> - The media's credibility should always be questioned.
> - The only good terrorist is a dead terrorist.
> - Governments do nothing well, save collect taxes.
>
> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
> -- Linux Rex         | RedWebMail by RedStarWare
> -- FatMan: home1.gte.net/res0658s/FatMan/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- Autodidactic Master of Arcane and Hidden Knowledge.
>