Computer Audio Asylum

Posted by Tony Lauck (A) on April 02, 2008 at 11:54:18

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

Your analysis that the ADC and DAC jitter are additive depends upon the assumption that the ADC and DAC sample clocks are independent. If they are not then the situation is complicated and the possibility of cancellation can not be easily excluded. Murphy's Law of Clocks: A multi-clock system requiring synchronization will have unsynchronized clocks, while a multi-clock system requiring unsynchronized clocks will have synchronized clocks.

Unintended synchronization of clocks was first observed by Huygens in 1673. More recently, it has been a factor in computer networks, where I have personal experience with the phenomenon and how it can impact performance as well as measurement accuracy.

Tony Lauck

"Perception, inference and authority are the valid sources of knowledge" - P.R. Sarkar

• RE: Measuring accuracy - Jpp would be lower - cics 01:24:30 04/03/08 (3)
  • RE: Measuring accuracy - Jpp would be lower - Tony Lauck 05:38:15 04/03/08 (2)
    • RE: Measuring accuracy - Jpp would be lower - cics 10:53:03 04/03/08 (1)
      • RE: Measuring accuracy - Jpp would be lower - Tony Lauck 14:33:06 04/03/08 (0)

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