[sdiy] Reasonable accuracy in midi->cv cv->midi

[Seb Francis]

Hi Karl,

Personally I would aim to get within at most 2 cents accuracy.  This is 
possible without too much difficulty with modern DACs and Opamps, even 
taking into consideration temperature dependent drift.

Even 2 cents out of tune is just about noticeable to a well trained ear, 
and when you have polyphony or multiple synths in tune with each other 
you will benefit from this kind of accuracy.  Remember also that errors 
are cumulative (sometimes in the same direction) - ideally you don't 
want to add to the tuning errors already present in your analog VCOs/synths.

If you want to save yourself a design job, I have some PCBs left for 
these projects:
http://burnit.co.uk/sdiy/index.php?page=fatcontroller
http://burnit.co.uk/sdiy/index.php?page=drumbox&subpage=schematic
http://burnit.co.uk/sdiy/index.php?page=3031&subpage=schematic

Seb


Karl Ekdahl wrote:
> Hi list, i'm on the verge of designing a midi->cv and
> cv->midi and was wondering what kind of precision is
> reasonable. How many cents of a difference can people
> hear and get disturbed by? I did a small test on my
> (probably inaccurate) computer and felt that at about
> 8 cents was the limit. Any thoughts?
>
> Karl
>
>
>