[sdiy] digital control of CV

[Andre Majorel]

On 2007-09-03 11:01 +0200, jure zitnik wrote:
> On 9/3/07, Andre Majorel <aym-htnys at teaser.fr> wrote:
> > On 2007-09-02 23:49 +0200, jure zitnik wrote:
> >
> > > also, you'd probably need more accuracy than 8-bit for VCO
> > > control, right? well, there's also 12-bit version which would
> > > probably do...
> >
> > Perfect 12-bit DAC = 3 cents resolution.
>
> that's enough, isn't it?

Only you can say. A +/-1 LSB 12-bit DAC will get you within +/-3
cents of your target. Worst case, an interval could be 6 cents
off. At 440 Hz, that's a 1.5 Hz beating.

> besides that, you could expand the curve to reflect the
> exponential shape of V/oct (if you have such VCO) so it would
> help getting appropriate resolution in the upper octaves.

That would be even more demanding for the DAC.

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
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