Pete Fowler;371575 Wrote: > So...did you read the article at the link? I appreciate that your comment was aimed at Pat, but might I make a comment?
Everyone seems to be getting at Pat without appreciating what he's actually trying to say. As I read it, he's merely speculating that perhaps in the real world, except in gross situations, the effects of jitter are not audible. Others have stated it is, and all he's asking for is references to some proper research to back up those claims. You have kindly provided a link to an article which presumably you believe supports the position that jitter is audible. I read the article and it strikes me that (among other things): - It explains what jitter is. (Many people, Pat included, already know what it is). - It has some interesting technical measurements with some alarming looking scope shots. Whether these measurements are actually relevant to the question in hand is not at all clear. - It discusses jitter's effect on the reproduced sound. This is done with listening tests - which of course is the only way to detect any audible effect. At no point in the article do they claim the listening tests were done blind. Call me an old cynic, but don't you think it's likely that if the test *was* blind, they would have mentioned it? My speculative conclusion: the tests were not blind. So, given the well-documented flaws of sighted comparison, shouldn't we treat them with some degree of skepticism? Especially in the light of the article having been published by a vendor of rather expensive audio DACs and such like (ie. perhaps they have some kind of vested interest)? Meanwhile, Benjamin and Gannon demonstrated back in 1998, *using blind listening tests*, that jitter less than 20nS was inaudible on music material. And in 2004, Ashihara et al demonstrated, *using blind listening tests*, that not one single listener in their panel of 23 people could discriminate jitter of less than 250nS. Granted their test used random (ie. uncorrelated) jitter, and this can be expected to be less audible than correlated. But some people here seem to be claiming that jitter around the 200pS region is audible. That's 3 orders of magnitude smaller. It frankly stretches the bounds of credulity. -- cliveb Transporter -> ATC SCM100A ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=56425 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
