[sdiy] simulate detune / polyphony with a single DCO

[Gordonjcp]

On Sun, Apr 09, 2017 at 05:23:31PM -0500, Chris McDowell wrote:
> 
> Howdy list, 
> 
> I've been playing with DCOs, and am realizing that detune or even polyphony (which would end up paraphony I guess) could be achieved with a single DCO. The idea is to use two timers in a microcontroller, pulsing the same pin that's used to reset the DCO's integrator. A built in DAC from the micro controls the rate of the integrator, and as detune increased, would adjust the slope. I have a PCB on the way to test all this out, looks good in LTSpice. 
> 
> Anyone heard of this being done before? Are there any glaring dumb oversights?

Wouldn't that give you a sync sweep effect, rather than polyphony?

You'd need to reset to two different levels if you wanted it to sound like two saw waves, surely...

-- 
Gordonjcp MM0YEQ