[sdiy] VCO Accuracy

[Andre Majorel]

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

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

>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.

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