"Ian Molton" wrote in message


Again though, the CD is read as fast as required to keep the
read-buffer half full, which is, in turn drained at a constant rate.
I cant see how jitter filling that buffer could manifest on the
output unless it was great enough to drain the buffer or cause a read
error that wasnt correctable, neither of which would really be
'normal operating conditions'...

You've got things right. The buffered read technique used by *every* optical
disc transport is in essence, a massive anti-jitter box. The jitter of the
digital data stream coming out of an optical disc transport is set by the
output clock, not mechanical vibration in the transport.

I've done experiements in which I measured the jitter coming out of a CD
player suspended a few inches above a large woofer playing various
frequencies at loud levels. The jitter showed no increase right up to the
point where mistracking started.