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In Reply to: RE: Dave Gordon is a wonderful guy... posted by Charles Hansen on April 16, 2009 at 18:29:56
Thanks for the response! I haven't seen that review, I will try to track down a copy to have a look.
The 'lock' LED certainly suggests there is a PLL being employed.
On the ARC website it says:
JITTER REDUCTION:
High-stability crystal-controlled re-clocking for all outputs
The word output is confusing. That aside, this suggests a VCXO is being employed? Would this be different than employing a 'low-pass filter on the PLL' you mentioned above?
I think the review is online at SoundStage.com.
As far as the specs page goes, clearly there is a misprint. They must have meant "inputs" and not "outputs". A PLL allows one clock to "lock" onto the same frequency as another clock. Most audio PLL's use a VCO (Voltage Controlled Oscillator) as the variable-frequency clock that "locks" to the incoming signal. Better implementations use a VCXO (Voltage Controlled Crystal Oscillator), which is still variable-frequency but uses a crystal for lower jitter.
For more on clocks, please read this post from Tony Lauck:
Thanks for the response, great link on clocking!
Found the review, no mention of the USB details other than "USB input receiver/CODEC from Burr-Brown"
> > Found the review, no mention of the USB details other than "USB input receiver/CODEC from Burr-Brown" < <
Well, that should tell you a lot right there. But that's not the full review. That was only Ken Kessler's text. The technical sidebar was not included in that excerpt on the importer's website.
Normally you can buy reprints online. But that particular one is not up yet.
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