What DACs are "reclocking"?


Are there many, many reclocking DACs, or is this particular feature limited to just a few makes and models? Also, how can one tell if a DAC is of the reclocking variety? If the description says something about a low-jitter clock, is that enough, or is that something else entirely? (Yes, I did search the archives -- and Google -- before posting this question.)
Thanks very much.
-- Howard
hodu
I asked this question because of a post regarding Apple's Airport Express. Poster was told he'd improve things by getting a reclocking DAC. What, I wondered, are those. (I stream to an AE, and have a Cambridge Audio Dacmagic.) Perhaps I should have been more specific in my query. If I'm looking for a better DAC, perhaps even a reclocking DAC, for this setup, what, specifically, should I be on the lookout for?
"All DACs playing regular Red Book CDs at 96 or 192 KHz (playback clock not an integer multiple of the incoming clock) employ some sort of reclocking."

Not true. Lots of DACs dont upsample and don have any kind of oscillator inside. It's not a requirement.

Steve N.
Empirical Audio