audioengr;147864 Wrote: > My point is that the buffer that is doing the decoding of the bits on > the disk is clocked by the PLL clock that is influenced by the jitter > on the disk. The clock that clocks the buffer input is identical to > the clock that clocks the buffers output. It is one PLL clock and it > gets jittery from the variable spacing of the bits on the disk. This > buffer is only a holding place in order to decode the bits. It is NOT > an elastic buffer for reclocking the bits. >
Out of interest I've just looked up the datasheet for the Sony cdx2500bx which is used as the cd cdcoder in my aging transport (Teac T1). This claims 32K of RAM for "wide-frame jitter margin (+-28 frames)". > > No matter how you look at it, if there is one PLL and it must track the > bit-rate coming off the disk, then it will be affected to some extent by > the jitter in the pits and motor speed-variation, loop-control, > mechanical resonance of the disk spinning etc... > So in the case of adding a Superclock to improve performance - do we replace the PLL clock with a fixed phase clock? I'm struggling to understand how that avoids compromising the data. -- Triode ------------------------------------------------------------------------ Triode's Profile: http://forums.slimdevices.com/member.php?userid=17 View this thread: http://forums.slimdevices.com/showthread.php?t=28621 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
