> Well CDs use the obscure rate of 44.1 kHz. Not 44 kHz, but 44.1 kHz. 
> Apparently this is due to some historical reasoning that I forget now.

I suspect it has to do with syncing with pre-existing video signals.

> I guess DVD uses 48 kHz for a similar reason...

48 kHz was already standard in recording studios on DAT tapes, and I assume 
it was also used for movie sound.  So that is why DVD used 48 kHz, but where 
that frequency came from in the first place I don't know.  48 kHz is quite a 
nice round number, so I guess they just made it up.

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