[sdiy] Digital accumulator VCO core?

David Moylan dave at expeditionelectronics.com
Tue Feb 9 16:53:36 CET 2021

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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