[time-nuts] Digital Mixing with a BeagleBone Black and D Flip Flop

Hal Murray hmurray at megapathdsl.net
Sun Oct 12 14:37:00 EDT 2014


anders.e.e.wallin at gmail.com said:
> Does it matter that the ADC in the sound-card is probably clocked by a
> crystal clock that is 50ppm off and has bad ADEV? 

You can calibrate the clock on the ADC.

One way is to feed a known reference frequency in on the other channel.  
(That's assuming you have a stereo setup and don't need the second channel 
for something else.)

Another way is to compare the sample rate with the PC clock.  That will 
correct for any long term drift but may not track shorter transients.

-- 
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