[sdiy] "Timer Controlled VCO" (TCVCO) ?

[Michael Zacherl]

On 23.Sep 2014, at 18:59 , ASSI <Stromeko at nexgo.de> wrote:

> On Tuesday 23 September 2014, 17:19:05, Michael Zacherl wrote:
>> recently I stumbled upon this in an interview [1] and wanted to find out
>> how this would be implemented in detail. But apparently it's a term
>> Stefan Schmidt just coined back then? Searching the Net isn't very
>> helpful, alas. It's a DCO variant, he stated … but what?
>> The term itself suggests some 'dualism' (timer controlled - voltage
>> controlled … ), so it's probably not too precisely formulated anyway?
> 
> If that term has any physical meaning (and looking at the source I would 
> hope it has, although I've not seen the interview) then I'd guess it really 
> is a VCO that's disciplined or synced via a digital timebase.

I'm going through an awfully gibberish thread and found this post (without it stating the source of information):
https://www.gearslutz.com/board/6535950-post313.html

"It uses VCOs. The output frequency of the VCOs is measured digitally. The frequency data is used to adjust the control voltage of the VCOs. This is opposed to the design of DCOs: DCOs use digital timers to trigger the oscillator cycle directly while Schmidt uses a pure VCO path which is digitally observed. This is similar to the well known autotune procedure of classic synths - but the autotune is able to adjust the VCOs all the time(!) and does not need to be operated manually from time to time."

So you're guess is probably right. 
Moreover all this modulation options hardly would be possible with DCO-ish designs, I'd say.



--
http://mz.klingt.org