Well, I mean analog DCO, not the digitally-generated waveform oscillator in VA.
Like, say, a DCO in a Curtis oscillator chip. From the data sheet, the oscillator frequency is still controlled by the input voltage. So I wonder, what actually is the part of the oscillator that is digital? How is that different from a VCO?
How does a DCO actually work?
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- KVRAF
- 6937 posts since 4 Jun, 2004 from Utrecht, Holland
Link to that datasheet plz?
Curtis' is not the only implementation, so there may be lots out there that control the frequency in a digital way.
Curtis' is not the only implementation, so there may be lots out there that control the frequency in a digital way.
My MusicCalc is temporary offline.
We are the KVR collective. Resistance is futile. You will be assimilated.
We are the KVR collective. Resistance is futile. You will be assimilated.
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- KVRAF
- Topic Starter
- 1628 posts since 3 Oct, 2001 from Thailand
Sorry, I misunderstood that. 
Actually, I was looking at Curtis VCF chips, and it was long ago, so my memory got it confused with DCO.
Anyway, my question still holds. How exactly does a DCO work in general? I mean, what is the fundamental difference from a VCO?
Actually, I was looking at Curtis VCF chips, and it was long ago, so my memory got it confused with DCO.
Anyway, my question still holds. How exactly does a DCO work in general? I mean, what is the fundamental difference from a VCO?
Peace, my friends. I'm not seeking arguments here. 
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- KVRAF
- Topic Starter
- 1628 posts since 3 Oct, 2001 from Thailand
For reference, here's the link to Curtis' data sheets: http://www.synthtech.com/cems.html
All of their oscillators seem to be VCOs though. So, I guess what makes something a DCO is in how the control voltage is generated?
All of their oscillators seem to be VCOs though. So, I guess what makes something a DCO is in how the control voltage is generated?
Peace, my friends. I'm not seeking arguments here.
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- KVRAF
- 8144 posts since 13 Jan, 2003 from Darkest Kent, UK
I think a classic DCO is effectively a digital to analogue converter slapped in front of a vco with some tuning feedback malarky going on to correct any drift in tuning ie. the output of the vco is checked every so often and if found to have drifted then adjustments are made.
So in theory, all the analogue goodness without the dodgy tuning. Whether that makes it sound 'sterile' is another debate...
.g
So in theory, all the analogue goodness without the dodgy tuning. Whether that makes it sound 'sterile' is another debate...
.g