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In Reply to: RE: Jitter created by various transports vs. jitter rejection on various DACs? posted by audiohound on November 04, 2009 at 20:46:15
What's going on here? Is the expensive player actually introducing more jitter than the Sony?
Likely. The cost or packaging of a component says little about the design quality. This difference can be because of internal jitter due to clock, poor design of the data path, return path issues, crosstalk or impedance mismatch. Just because its an expensive, heavy transport does not mean that the designer knows digital design or transmission-line treatments. These areas are often "copy-cat" designed in the high-end audio industry IME. I've modded a lot of high-end transports, so I have seen crazy things. The well-designed source is definitely the exception.
If I want to problem-solve and use the expensive transport, would something like a Monarchy DIP work to reduce jitter?
It might, a little.
Or....if I buy a better DAC, perhaps something like the Lavry again, will it "reject" the jitter?
It might, a little.
How is jitter "rejected" or "corrected" if the "bus isn't coming at the same time each day" from the source component(DAc)?
DACs that reduce jitter usually use one of two methods:
1) ASRC - Asynchronous Sample-Rate Conversion, where the incoming signal is tracked, but upsampled to usually a higher rate with a DAC clock. The hardware upsampler and the clock jitter are critical. This will usually not make the input immune from the effects of jitter in the signal.
2) multiple PLL stages - the internal clock of the DAC changes frequency to "lock-onto" the incoming stream rate. This has the disadvantage of being somewhat sensitive to incoming jitter depending on the PLL design and of course the clock jitter is critical.
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