[sdiy] Tuneable CV Quantizer

[Theo]

Yes I have to agree, variable threshold would be interesting for timing
changes.
I only thought about this last night after I went to bed.
But with completely free thresholds, like you need to put step 7 before step
6, I still see mayor problems.
What I came up with is a chain of potmeters, the "bottom" of the pot
connecting to the wiper of the next lower placed pot.
But this won't let you have steps change places and the potmeters won't act
"independent".

The only way I can think of  to make it work with completely free threshold
levels, is to use a "last note priority" system.
But I don't see a easy way to do this without using a uC.

Theo


From: John L Marshall <john.l.marshall at gte.net>

> I see a "window" of opportunity to create single output.
>
> The idea of using the concept as sequencer has been of interest to me for
> awhile. If thresholds can be individually set then the timing for each
step
> can be independently set. For example; while the sequencer is playing the
> threshold for step 7 could be gradually lowered to less than step 6. Then
> the sequence becomes 7 before 6.
>
> This type of sequencer could create sound patterns and gradually shift
them
> over time like Steve Reich used to do.
>
>
>
> ----- Original Message -----
> From: Theo <t.hogers at home.nl>
> To: John L Marshall <john.l.marshall at gte.net>;
<synth-diy at dropmix.xs4all.nl>
> Sent: Thursday, September 27, 2001 10:59 PM
> Subject: Re: [sdiy] Tuneable CV Quantizer
>
>
> > Just setting up 64 comparators ain't gona work since all comparators
with
> a
> > lower threshold as the input will be activated.
> > Therefore there must be a kind of priority system to select only one
> active
> > output.
> > What you describe is most easily done with a AD converter and a 64 x
> > multiplexer.
> > You would have no input threshold potmeters, but for what you describe
> > (standard issue quantizer use btw) these are not needed anyway.
> > But if it is just about having loads of potmeters, you might put up 64
> fake
> > pots ;^)
> >
> > Theo
> >
> >
> > From: John L Marshall <john.l.marshall at gte.net>
> >
> > > Again, I like the idea of 64 comparators with adjustable input
> thresholds
> > > and 64 pots to set the output level.
> > >
> > > You can do Harry Partch music with 43 notes per octave.
> > >
> > > Feed an up ramp in and you can do the sequencer thing.
> > >
> > > Feed a down ramp in and the sequencer runs backwards.
> > >
> > > Feed a triangle in and the sequencer runs upand down.
> > >
> > > Lower the amplitude and the sequence shortens.
> > >
> > > With the pots you can create quantization errors (backward steps).
> > >
> > > Real synthesizers have lots of pot.
> > >
> > >
> > > ----- Original Message -----
> > > From: Steve Ridley <spr at spridley.freeserve.co.uk>
> > > To: <synth-diy at dropmix.xs4all.nl>
> > > Sent: Thursday, September 27, 2001 12:46 PM
> > > Subject: Re: [sdiy] Tuneable CV Quantizer
> > >
> > >
> > > >
> > > > > I am currently trying to figure out a way to build a tuneable
> > quantizer
> > > so
> > > > I
> > > > > can get non-standard tunnings and that type of thing. Does anyone
> know
> > > > > of anything like this that is around yet that I can maybe hunt the
> > > > schematics
> > > > > down for, or any ideas on how I could make this work.  I have not
> had
> > > much
> > > > > luck trying to figure this one out yet, any help would be
> appreciated.
> > > >
> > > > The Buchla 246 Sequencer could double as a sort of quantiser.  It
had
> > > > voltage selection of stage, so you stick a CV in there and the
output
> > > > steps between the pot settings.  If you're going to have a quantiser
> > with
> > > > loads of pots, it makes sense that it can double as a sequencer.
> > > >
> > > >
> > > > Steve Ridley
> > > >
> > > >
> > > >
> > >
> > >
> >
>