a question about terminology - do you guys call all of these square
waves, or only the top one?  I would say only the top one, but maybe
there's a different terminology in different fields:

http://en.wikipedia.org/wiki/Biphase_Mark_Code

By the way, that shows nicely how the clock and data are encoded in
SPDIF.  The bottom signal is the one that actually gets sent down the
line (ideally).  

To see something perhaps closer to what really gets received by the
DAC, see Figure 6 here:

http://www.stereophile.com/reference/1093jitter/index1.html

so you can see why there is jitter...


-- 
opaqueice
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