FYI: dCS is the first company who wrote digital audio upsampling algorithm for mastering use. I know a few more for reading but dCS is quick catch with google search and pretty much good enough for basic explanation. Engineers there know a lot better than a few learning books where specialized experiments and patented information are not shown. I experienced a few masterclocks myself from cheap ones to highest available ones like Esoteric's rubidium clock and I know what I'm talking about and how that affect changes in system.
Maybe I shouldn't mix highend stuff in this topic. My bad.....I should stay silent now as mp3 vs cd is already over.
It's very interesting. What are the perceptual differences between a rubidium clock and a cheaper one? How did all those audiophiles describe the differences?