>> 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 think you're right.

>> 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.

Seems plausible at least.

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