Computer Audio Asylum

RE: And all those specs relate....

67.164.165.165

In Reply to: RE: And all those specs relate.... posted by alan m. kafton on February 25, 2008 at 22:16:51

Well, the average frequency accuracy is an easy one. Static frequency accuracy of the clock relates directly to pitch accuracy in the same way that speed accuracy of a turntable does.

Jitter is much more complicated though. You might have jitter that happens at a 120 Hz rate due to power supply ripple modulating the clock. Or you might have jitter that's purely a random frequency modulation, like white noise. Or you may have some combination of these, or other data-correlated jitter.

Since a static frequency accuracy spec (without specifying jitter) only relates to pitch accuracy, and normal crystal oscillators are already extremely accurate in this regard, the static frequency accuracy provided by an atomic clock is of no real consequence.

It's really the jitter that matters, and that's my point. Further, the jitter of an isolated component such as a clock is usually not the whole story either. You have to look at how all the contributors to jitter work together.

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