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Clock Crystal Accuracy
Clock Crystal Accuracy
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Old 14th February 2020, 11:31 PM   #1
poynton is offline poynton  United Kingdom
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Default Clock Crystal Accuracy

.
I know that the frequency of my CD player is 16.9344MHz.

What difference would it make using a clock oscillator with a frequency of 16.9340MHz?


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Old 14th February 2020, 11:45 PM   #2
martin clark is offline martin clark  Europe
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That's 400ppm low.

Somewhere in the back of my mind I thought Red Book cd recommends +/-200ppm; I might be wrong on that.

Practically, as a clock in a standalone CD player - no issue at all: - it's the close-in LF phase noise ('goodness' of teh clock source) that seems to make a difference. *

that said, if you plan on using he result as a transport to a dac - probably won't matter, but it might depending on how tight/ exactly how that dac is programmed to lock to the datastream.


* musically - 400ppm low average is likely >= 2dec places below what even the finest human sense of pitch can perceive; so no issue at all, muscally

Last edited by martin clark; 14th February 2020 at 11:47 PM.
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Old 15th February 2020, 12:07 PM   #3
martin clark is offline martin clark  Europe
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Edit - got my maths wrong; that's only 25ppm out. Don't worry about it.
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Old 16th February 2020, 09:18 AM   #4
Mike P is offline Mike P  England
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Martin is right (as usual).

What matters for audio (assuming use as a single box player) is 'jitter' of the clock signal. As long as it's within sensible tolerances the absolute frequency of the clock being a tiny amount out doesn't matter, it won't be audible.
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