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In Reply to: RE: How can USB performance impact audio quality? posted by Tony Lauck on June 13, 2011 at 12:31:04:
"You didn't get the distinction I made between jitter coupled from the input signal and jitter in the local oscillator."
I do understand. I've been doing this for more than 30 years. It is possible to have jitter in the input USB signal coupled by power supply modulation in a shared supply, or by RF coupling or by ground bounce coupling. All indirect effects.
"While I have no doubt that poorly designed or implemented isolation stages may fail to isolate jitter, they certainly do not add jitter in a proper clock architecture.
I would agree, with the caveat that the isolation take place prior to the master clock domain.
"When measuring jitter, it's the jitter spectrum that matters not the total jitter energy. Specifically it's the jitter spectrum in and near the audible band that is going to produce sidebands that will be perceived as audible distortion."
I know this also. I have written a few white-papers on the web that echo this, most about 4-5 years ago. They are still on positive-feedback.com.
Steve N.
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- RE: How can USB performance impact audio quality? - audioengr 10:33:11 06/14/11 (0)
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