[sdiy] Voltage controlled FPGA based synth?

[Needham, Alan]

My take on this ... Absolutely ! if something is voltage controlled
as opposed to current controlled (both analogue signals) or digitally
controlled, either data stream or binary (gate?) then there can be no
doubt.
If the FPGA is using this signal to control any parameter then why
should it be any different to my mid-1970s VCOs with digital logic
in them.
Also, as evidence, I never heard anyone complain about VCDCOs ???
The term describes its control NOT its contents !

	Alan

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Tom Wiltshire
Sent: 13 July 2007 11:48 AM
To: karl dalen
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Voltage controlled FPGA based synth?



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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