Originally Posted by clarke68
I haven't read it yet (it's quite long), but it's written by an engineer at Burr-Brown who worked on the PCM2702, a USB controller chip with a built-in DAC. If no one beats me to it, I'll post a nutshell version after I read it.
Okay, I'm only half-way through, but I've read enough to write that, in a nutshell:
No way is USB inherently jitter-free.
Not that its terrible, it's problems can be overcome with highly skilled engineering and/or expensive parts. Overall, that makes it no better or worse than s/pdif, whose problems can also be overcome with highly skilled engineering and/or expensive parts.
Originally Posted by rickcr42
The USB connection is potentially a lot better because it totally eliminates the spdif interface where a lot of the jitter comes from
Perhaps I haven't reached that part of the article yet, but my take at this point is yes...potentially
. An expensive, well engineered usb solution could be a lot better than a cheap, poorly engineered s/pdif solution.
true that s/pdif introduces a lot of jitter into the signal. USB can be used to eliminate it, but jitter comes from a lot of different places, and usb definitely has its own limitations and challenges.
There's just no such thing as a free lunch, there is no magic bullet (no data transfer protocol, file format, up/over/non-sampling, or whatever) that's going to solve all of digital audio's problems. Like most problems, this will be solved with a lot of two things: time and money.