[time-nuts] Using cheap sound cards for measurements

[Hal Murray]

>> Add internal or external (5/10 MHz) clock.

> None will have that...<grin> Maybe a multiple of 48 or 44.1 kHz 

The key idea is to have an external clock input.  I don't think the frequency 
is critical for our usage.

All the audio chips I've looked at have a DSP filter that scales with the 
clock frequency.  I'd expect them to work as long as the clock isn't too 
fast.  You will just get a strange sampling rate.

The analog front end has a rough anti-aliasing filter.  You might get 
troubles if the clock is too slow and the input signal has energy in the band 
that gets aliased down on top of the signal.




-- 
These are my opinions, not necessarily my employer's.  I hate spam.