[time-nuts] disciplining sound card

[Hal Murray]

azelio.boriani at screen.it said:
[couple some 1-pps energy into the signal being digitized]
> Yes, very smart, this analog time-stamping approach. 

There is another trick you can use in this area.

If you can watch a PPS signal, you can figure out the frequency of the clock 
used by the A/D system.

If your system clock is stable, you can also get the clock rate of the A/D 
from the arrival times of the data blocks.

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