SV: Re: [sdiy] Voltage controlled FPGA based synth?

[Anthony Rolando]

I read this in the comments at matrixsynth:

"swissdoc said...
The most important fact about the Airböurne Synth may be, that is using 
FPGAs in most of it´s modules, so actually the VCO is a digital realized 
oscillator (via FPGAs) driven by a voltage. Same for the filter and the 
LFO´s and Env´s, the VCA is a "normal" analog one.

The connectors are from the professional audio/video patch panel 
manufacturer http://www.ghielmetti.ch/, where Martin is working, so I think 
the patch cords are quite durable.

Georg."

I suppose I should not assume that Georg actually knows anything about this 
project...

TR


>From: karl dalen <dalenkarl at yahoo.se>
>To: Anthony Rolando <goldenechos at hotmail.com>, tom at electricdruid.net
>CC: synth-diy at dropmix.xs4all.nl
>Subject: SV: Re: [sdiy] Voltage controlled FPGA based synth?
>Date: Sat, 14 Jul 2007 00:50:04 +0200 (CEST)
>
>Where do you see that statement? I cant find it!
>Odd to put in a analog VCA when a digital is just a mul in the FPGA!
>
>KD
>
>--- Anthony Rolando <goldenechos at hotmail.com> skrev:
>
> > If you read the fine print the designer states that the VCA is actually
> > analog... so that is "correct terminology there.
> >
> > Besides, VCO reads easier and sounds better then FPGACO. That is a good
> > enough reason to call it so imo.
> >
> > TR
> >
> >
> > >From: Tom Wiltshire <tom at electricdruid.net>
> > >To: karl dalen <dalenkarl at yahoo.se>
> > >CC: synth-diy at dropmix.xs4all.nl
> > >Subject: Re: [sdiy] Voltage controlled FPGA based synth?
> > >Date: Fri, 13 Jul 2007 11:48:19 +0100
> > >
> > >
> > >On 12 Jul 2007, at 22:55, karl dalen wrote:
> > >
> > >>But why name things Voltage Controlled, (e.g VCA) when its FPGA
> > >>generated?!
> > >
> > >What do other people think about this? If a circuit is controlled  from 
>a
> > >voltage that then goes to an AD convertor, is it a voltage- controlled
> > >circuit? Obviously it's a digital circuit, not an analogue  one, but is 
>it
> > >a voltage-controlled digital circuit? Perhaps the AD  isn't really a 
>part
> > >of the circuit and that what controls the circuit  is the digital 
>output
> > >from the A/D? What about if the A/D is on the  same chip?!
> > >
> > >Or is this just a question of terminology?
> > >
> > >Personally, if you can grab a LFO from somewhere and feed the output  
>of
> > >that to it to make something happen, I'd call it a voltage- controlled
> > >circuit. It might be digital inside, but it's still  
>voltage-controlled.
> > >
> > >
> > >
> > >
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