Redbook CD/SPDIF clock tolerance spec ? - diyAudio
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Old 14th May 2012, 05:32 PM   #1
percy is offline percy  United States
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Default Redbook CD/SPDIF clock tolerance spec ?

Somewhere on the net I read that the Redbook CD (or is it SPDIF?) has a clock tolerance specification of 12UI. But I can't find any further definite information about this spec.
Is this true ? And if so what exactly does this mean ? 12UI per second ? per million UIs (ppm) ?
And is it really a Redbook CD spec or an SPDIF spec ?
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Old 14th May 2012, 06:41 PM   #2
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UI = Unit Interval. A Unit Interval is one way to specify jitter. One UI = the period for one data bit in serial data channel. So, it is not a constant and varies with the data rate. For example, one UI for a typical 2.8224Mbs CD digital audio stream = 354ns. I don't know what the rebook spec. calls for, but I believe they would be specifying maximum permissible jitter.
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Last edited by Ken Newton; 14th May 2012 at 06:43 PM.
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