[LAD] A little quiz about audio measurements...

[Veronica Merryfield]

On 05/28/2010 02:31 PM, fons at kokkinizita.net wrote:
> Hello all,
> 
> This week I had to perform measurements on a audio
> interface, and this resulted in some quite interesting
> results. Before revealing what happened, I'll let you
> have a look at some of the data and come up with your
> own conclusions, see
> 
> <http://www.kokkinizita.net/linuxaudio/quiz.html>
> 
> (Free beer at the next LAC for the best analysis)
> 
> Ciao,
> 

You can't trust a loop back test. 

Any instability or dither on the reference clock of card A (fifo clocking say) is not going to show in a loop back test. 

Vrnc