[sdiy] Cheap Midi->CV

[Andre Majorel]

On 2005-09-07 00:29 +0200, Simon Brouwer wrote:
> Hi Michael,
> 
> At 21:12 6-9-2005, you wrote:
> > (...)
> > I like the "hit the bench" mentality - it's so DIY! If you
> > can live with 12 bits check out Mr. Maddox and his now GPL
> > PolyDAC.
> 
> I had thought that 12 bits would be plenty.
> 
> The AD8300 that Paul uses has a maximum integral nonlinearity error of
> 2 LSB. Add to this a quantization error of 0.5 LSB. With a full scale
> of 10 V (10 octaves) that would amount to an error voltage of ca.
> 0.0061V, or 0.073 of a semitone interval. With a full scale of 5 or 6
> octaves the error voltage would be correspondingly smaller.
> 
> Do you think having more pitch accuracy than that would be worthwile?

I don't need a frequency counter to know when a guitar string is
7.3 cents off. So yes, probably.

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