[sdiy] Digital accumulator VCO core?

cheater cheater cheater00social at gmail.com
Tue Feb 16 07:07:09 CET 2021


On Tue, Feb 16, 2021 at 2:43 AM Brian Willoughby
<brianw at audiobanshee.com> wrote:
>
> On Feb 15, 2021, at 17:34, cheater cheater wrote:
>
> >> How do you avoid canceling out the step itself?
> >
> > You don't. You want it to cancel out.
>
> Wait. This doesn't make sense. If you cancel out the step in a sawtooth, you don't have a sawtooth any more. How does that work?

the sample you use contains both of the following things: a band
limited step, and a negated naiive step. The negated naiive step
cancels out the one from your naiively generated accumulator saw wave.
This gets only cancelled out on one single audio sample. Essentially
the abrupt jump gets moved by one sample over (depending if it's a
falling or rising saw), and where the jump was previously, a sample of
value zero is put. Then, the band limited step replaces that zero
sample and also influences one sample before and one sample after.



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