[sdiy] Digital accumulator VCO core?

Tom Wiltshire tom at electricdruid.net
Tue Feb 9 17:38:08 CET 2021


I found it in the end! (It had been bugging me that I couldn’t remember). It was Ryan Williams, on his "Homebuilt Hardware” site, now no longer:

https://web.archive.org/web/20160315092902/http://www.homebuilthardware.com/index.php/projects/dspicvcdo/

Tom
==================
       Electric Druid
Synth & Stompbox DIY
==================



> On 9 Feb 2021, at 15:32, Richie Burnett <rburnett at richieburnett.co.uk> 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, 
> 
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