Improvement on cd-players (Off Topic)

by Guido tent , Wednesday, October 17, 2007, 23:45 (6028 days ago) @ madprofessor

dear Stephan,

You are missing the point. ppm's are of no importance for playback quality of DACs.

What matters is jitter (at the moment of conversion).

The generator you refer to may be very precise in terms of absolute frequency (ppms'), this does not imply that it doesn't jitter.

On the contrary, the fact that it is programable and lockd to GPS makes me conclude that it is a frequency synthesiser; The inner PLL/VCO therefor is never based on crytals hence the jiter caNot be as good as that of a decently designed clock.

For a very short but clear insight in the difference between ppm's and jitter, please look here:

http://www.tentlabs.com/InfoSupport/Technology/page34/page34.html

best regards
-
Guido

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