Folderol wrote:
> On Fri, 28 May 2010 19:20:54 +0200
> Ralf Mardorf <ralf.mardorf@email-addr-hidden-dsl.net> wrote:
>
>
>> Veronica Merryfield wrote:
>>
>>> On 05/28/2010 02:31 PM, fons@email-addr-hidden 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
>>>
>> Is Veronica Merryfield the winner?
>>
>
> I'm highly suspicious of the USB link, but can't quite put my finger
> on why.
>
Card A is the USB card. For USB there could be several issues, but I
don't have knowledge about buffering etc., but I guess it's card A and
that there's a "instability" = jitter. I don't know what dither for CLK
is. I guess the winner is Veronica Merryfield.
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Received on Sat May 29 00:15:03 2010
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