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RE: Measuring accuracy - Jpp would be lower

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In Reply to: RE: Measuring accuracy - Jpp would be lower posted by cics on April 01, 2008 at 01:54:43

I'm curios if you would get the same results by repeating the measurements a few more times. My guess would be that they would vary because the numbers you obtained can't be an absolute unchangeable value.

My point was not to reduce the Jpp value because of the jitter introduced in the A/D process. What I think is that without you knowing exactly what amount of jitter imparted the ESI card in each measurement instance you can't treat the results you've got as absolute values, especially when the difference is just 4ps.

You didn't say how it sounded with the DAC as Master. Did you listen to it in this way or just made the measurements?

Follow Ups:

RE: Measuring accuracy - Jpp would be lower - cics 08:38:38 04/01/08 (0)
I'm curios if you would get the same results by repeating the measurements a few more times. My guess would be that they would vary because the numbers you obtained can't be an absolute unchangeable value.

Measurements were repeated and over separate days. Even at 24/88.2, I got to same 72ps. Likewise, on DAC master setup, measurements were same at 76ps.

A 4ps difference is 5.6% worse - that's material in a game where everything counts.

You didn't say how it sounded with the DAC as Master. Did you listen to it in this way or just made the measurements?

Same as before.

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