[sdiy] Digital accumulator VCO core?

cheater cheater cheater00social at gmail.com
Tue Feb 9 17:48:12 CET 2021


Yeah, a DCO is basically the exact opposite of what I'm proposing here.

On Tue, Feb 9, 2021 at 4:56 PM David Moylan via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> Of course there's also the in-betweener Roland style DCO where the
> digital side provides a voltage to control the charge rate of a saw core
> and sync pulse to reset it.
>
> On 2/9/21 10:32 AM, Richie Burnett wrote:
> >> There was someone here some years ago who’d done a voltage-controlled
> >> oscillator on a dsPIC. The cunning part of that was that the output
> >> waveform was a triangle instead of a ramp. That massively reduces the
> >> aliasing problems...
> >
> > Neat!  I wonder if you could take that process all the way and have
> > the NCO output a sinewave (to remove all aliasing.) Obviously you
> > could easily use analogue electronics to derive a square wave from
> > that with a comparator, but not sure how you could shape it into a
> > triangle or sawtooth waveform!?
> >
> > I guess it's all irrelevant really though as BLIT, BLEP, minBLEP,
> > poly-BLEP etc, all work very well for directly generating the common
> > analogue oscillator waveforms at 48kHz or 96kHz sample rates.
> >
> > -Richie,
> >
>
> --
> David Moylan
> Expedition Electronics
> sonic adventures!
>
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