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

[Ralf Mardorf]

Ralf Mardorf wrote:
> Veronica Merryfield wrote:
>> Just thinking about what I had wrote and remembered the semantics 
>> used here...
>>
>>  
>>> One more hint: card X is a very high end one. It should
>>> be 'perfect', or at least much better than card A.
>>>     
>>
>> ... which might suggest that Card X is not performing well. Since it 
>> has been stated the card x is not USB, it is possible that this card 
>> has it's audio clock derived from the PC clock which is likely 
>> dithered - they call it spread spectrum to help reduce radiated noise 
>> in testing.
>>   
>
> http://www.maxim-ic.com/app-notes/index.mvp/id/3503
>
> And how would this cause the issue?

Ok this would cause jitter because of the slew rate? But is there a 
distance of (around or exactly) 100 Hz? Will the card itself split the 
clock from 1000 Hz to 100 Hz? I guess the standard clock by RT kernels 
will be 1000 Hz. Right?