[sdiy] Wikipedia DCO article

[Bob Weigel]

Oh we'll work through it.  I added some more stuff and fixed that.  I 
keep thinking of things I meant to include to get the whole perspective 
right.  Noting the similarity between the DK600 and Polymoog in 
particular. While the polymoog is really more like a Crumar trilogy with 
71 cards instead of 6 (and yes they're all preset but hey...just need 
someone to interface a programming setup with dcr's right? :-)   The 
project I'll probably be almost finished with on my dying day..)

But regardless both have analog HF oscillators that drives two divide 
down 'ranks'.  On polymoog they reshape one to saw.  While the 
organization is a little different everything having to do with 
oscillation is certainly fairly similar.  So if the Siel is a DCO 
machine so was the polymoog and so should be the Hammond Novacord I 
think for that matter no? -Bob

Tom Wiltshire wrote:

>
> On 13 Jan 2009, at 10:40, cheater cheater wrote:
>
>> 8<---
>> Confusion over terminology
>>
>> The term "digitally-controlled oscillator" has been used to describe
>> the combination of a voltage-controlled oscillator driven by a control
>> signal from a digital-to-analog converter, and is also sometimes used
>> to describe numerically-controlled oscillators.
>>
>> This article refers specifically to the DCOs used in many synthesizers
>> of the 1980's. These include the Roland Juno-60, Juno-106, JX-3P,
>> JX-8P, and JX-10, the Korg Poly-61 and Poly 800, and some instruments
>> by Akai and Kawai.
>> 8<---
>> This paragraph doesn't actually state which of these definitions is  
>> correct.
>
>
> I admit I was rather hoping to avoid that particular minefield.  
> Instead I chose to just say what the article considers under the  
> heading, and avoided whether other designs of DCO are properly called  
> "DCO" or not.
>
> Just for the record, I don't think a VCO driven from a DAC is a DCO  
> (otherwise the Prophet 5 would be a DCO synth, which it isn't) and I  
> don't think NCOs are DCOs either, since there is a different, more  
> specific, term for those.
>
> That still leaves quite a few designs in the middle ground (like the  
> BIt 01) beyond the typical ramp-core-plus-reset-pulses DCO that I  
> started out by describing.
>
> T.
>
> PS: Thanks for your work on this, Bob, and thanks for the comments  
> everyone else.
>
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