[sdiy] VCO Accuracy

[Roy J. Tellason]

On Tuesday 01 January 2008 10:33, Andre Majorel wrote:
> On 2008-01-01 00:36 -0500, Roy J. Tellason wrote:
> > On Monday 31 December 2007 04:29, Andre Majorel wrote:
> > > You don't have to tune by ear. There are very precise digital
> > > frequency counters. The bench ones only display the frequency in
> > > Hz but some of the software ones show note number and offset in
> > > cents.
> >
> > First I've heard of that.  Anybody know of any software ones
> > that run under linux?
>
> There's this :
>
>   http://www.teaser.fr/~amajorel/misc/aufreq-standalone-2008-01-01.tar.gz

Hehe.  When I went to save that,  I found that I already had an earlier 
version of it (without the date in the name) stashed away in my 
downloads/audio directory.  :-)  I guess it's good that I'm at least that 
organized but also that I'm working on sorting through and dealing with the 
massive amount of stuff that I've downloaded and not done anything with over 
the past several years...

> You need OSS emulation in the kernel (/dev/dsp).

I remember seeing one of those in /dev.

> From the tests I've made with mathematically generated sines, it's
> accurate to at least 0.0001 cents between 10 Hz and 1 kHz. Above 1 kHz,
> the accuracy goes down fast. At 20 kHz, it's only accurate to
> about 1 Hz or 0.1 cents.

My hearing doesn't extend to anywhere near that far out any more,  so I guess 
for me that's not likely to be a problem.  Thanks for the link.

-- 
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