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Music servers and other computer based digital audio technologies.

RE: Auralic Vega degrading Music Drop Outs.

First of all, judging from the marketing literature alone I can see that either the marketing literature is incorrect or the product is misdesigned.

1. The question of "jitter" rather than "frequency".
2. The existence of any clock modes whatsoever in the case of the USB interface which is (supposedly) asynchronous. There is no reason not to run the clock at its nominal mode.

Of course it could be that the marketing department and the engineering departments don't talk to each other and this would be normal in a big company, but not in a boutique company.

One can distinguish between jitter vs. frequency over time. Jitter is bounded by eye patterns (fractions of bit clock time) or frame times (isochronous rate). Therefore frequency estimation at the receiver becomes increasingly accurate as lock time increases. No engineer designing a device that employs digital communications will be able to make reliable products if he can not keep these concepts separate. My experience working in a computer company shows that few engineers are sufficiently competent to do this kind of work, although I was fortunate to have worked with a number of people who were.

Fortunately, Fred, you are not designing digital audio interfaces.


Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar


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