SynthModules

My personal feeling is that calculating SNR and THD from a 24 
bit FFT is more accurate than a voltmeter. The FFT shows you its 
own error contribution, where the voltmeter does not.

Everybody uses a different method, there is hardly any way to 
compare such specifications accurately.

--- In SynthModules@yahoogroups.com, "john mahoney" 
<jmahoney@g...> wrote:
> > It might be useful to note that signal to noise ratio is different
> > than the noise floor. The noise floor is the actual hiss 
(thermal
> > noise).
> 
> Thanks for clarifying that, Grant!  (I had my doubts when I 
posted it, but
> that didn't stop me. ;-)
> 
> I was poking around the Bergfotron site, yesterday. It has a 
chart
> http://www.idg.se/personal/bergfors/bergfotron/VCA.htm which 
got me
> wondering -- there are 2 SNR columns and some "attenuation" 
columns. Oops!
> Then I looked at an Analog Devices VCA datasheet that had 
both SNR and
> dynamic range specs, and I knew that a correction was in 
order.
> --
> john