Synth-DIY Yahoo! Groups Archives

Is DCO2 digital?

2013-12-20 by <aaron3900@...>

I've been able to confirm through a couple of Internet sources that DCO2 on the Poly-61 (the 800's predecessor) is a purely digital oscillator, rather than an analog oscillator under digital control, like DCO1. One article I found said that DCO2 on the 61 "is just a 4 bit binary counter with some resistors on the outputs forming a very simple and cheap digital-to-analog converter."

Is the same true of the 800? Can anyone confirm?

Thanks!

Aaron

RE: [korgpolyex] Is DCO2 digital?

2013-12-20 by Greg Coben

Not sure, but the description of DCO appearing at http://en.wikipedia.org/wiki/Digitally_controlled_oscillator is what I always understood DCO to be.

Greg

“80 Waves”

http://www.80waves.net

From: korgpolyex@yahoogroups.com [mailto:korgpolyex@yahoogroups.com] On Behalf Of aaron3900@...
Sent: Friday, December 20, 2013 3:20 PM
To: korgpolyex@yahoogroups.com
Subject: [korgpolyex] Is DCO2 digital?

I've been able to confirm through a couple of Internet sources that DCO2 on the Poly-61 (the 800's predecessor) is a purely digital oscillator, rather than an analog oscillator under digital control, like DCO1. One article I found said that DCO2 on the 61 "is just a 4 bit binary counter with some resistors on the outputs forming a very simple and cheap digital-to-analog converter."

Is the same true of the 800? Can anyone confirm?

Thanks!

Aaron

Re: [korgpolyex] Is DCO2 digital?

2013-12-23 by Michael Hawkins

On the Poly-800, both oscillators are digital. The tone generator chip is the MSM5232. It has 8 DCO's split into two pairs of four DCO's. Each group of four is driven by its own master clock. Detuning is done by slightly varying the master clock phase of DCO2 away from DCO1.

Mike

On Friday, December 20, 2013 3:27 PM, Greg Coben <GregCoben@...> wrote:

Not sure, but the description of DCO appearing at http://en.wikipedia.org/wiki/Digitally_controlled_oscillator is what I always understood DCO to be.

Greg

“80 Waves”

http://www.80waves.net

From: korgpolyex@yahoogroups.com [mailto:korgpolyex@yahoogroups.com] On Behalf Of aaron3900@...
Sent: Friday, December 20, 2013 3:20 PM
To: korgpolyex@yahoogroups.com
Subject: [korgpolyex] Is DCO2 digital?

I've been able to confirm through a couple of Internet sources that DCO2 on the Poly-61 (the 800's predecessor) is a purely digital oscillator, rather than an analog oscillator under digital control, like DCO1. One article I found said that DCO2 on the 61 "is just a 4 bit binary counter with some resistors on the outputs forming a very simple and cheap digital-to-analog converter."

Is the same true of the 800? Can anyone confirm?

Thanks!

Aaron