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In Reply to: RE: Very good question.- and a non answer posted by ahendler on June 27, 2015 at 13:29:40
Absolute nonsense. A post pulled out of your rear end.
Follow Ups:
You have such a way with words. Are you saying that Ethernet cables cannot produce jitter? The demonstration at CES was done by Prism Electronics who make professional digital gear for recording studios.
Alan
I am very well aware of who Prism is.But you don't give any information about how the demo was run, what product they were hawking, what their commercial interest was, and any other details.
Just "long ethernet cables cause jitter, I saw it a CES".
Audioquest was also "demonstrating" their CAT7 cables were "better" than the cheapest CAT5 with classic snake oil tactics.
I don't think Prism is in that category btw. But they were there at CES for a reason and there must have been an endgame.
Edits: 07/01/15
They were at CES because they had a prototype dac which they wanted to see if there was any interest in it. The demo consisted of a digital 1000hz signal that they sent to a dac (not there dac) over a 30 meter Ethernet cable. At the output of the dac they filtered out the 1000hz signal leaving a bunch of squealing sounds and tones which were very audible. The gentleman from Prism said that was the sound of cable induced jitter.
He said there can be jitter in the original recording, cable induced jitter and jitter caused by the dac.
Alan
This sounds like a BS marketing pitch. Beware demos. They are easily rigged. There is jitter on Ethernet packets, but this has nothing to do with audio jitter. The coupling of network jitter to audio jitter, depends on the protocols used and the quality of the implementation.
What protocol was used?
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Exactly. Demos in a commercial setting are to be viewed with the high levels of suspicion.
Classic marketing technique..create a problem, then sell the marks the solution.
Thank you for filling in the details. Interesting.
30 meters is exceptionally long and as the rep said, there are numerous causes of jitter, but there are also numerous causes of noise in a run that long.
My question would be how do they did know the sounds that were heard were the sounds of "jitter"? How about power supply noise? How about RFI/EMI?
Yes you are right about all the other factors that could be causing the sounds. Over at prismsound.com they have a video dealing with dacs and measureing the performance of dacs. It is over 1 hour long so I have not had a chance to view it. When I do ,if there is any additional info about jitter I will post again
Alan
Thanks for doing follow up.
I must say I have never, in years of reading CA forums and reading literature, heard of jitter manifesting itself as audible noise. I have always thought the conventional wisdom is that it cause timing errors.
If someone can point to a source that that identifies jitter as audible noise, I would be interested to see it,
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