Quote:
Originally Posted by Dan Lavry /img/forum/go_quote.gif
I hope my post provides basic enough information to understand that jitter is not just one more made up stuff such as the "need to keep a minimum cable length".
And while direct measurements of jitter are costly and require much expertise, the IMPACT of jitter in terms of distortions and noise is measurable with a good audio test system. The key is to decide what kind of distortion, and at what level the ear is impacted. Clearly, if I suddenly stopped you CD player for an hour and then restarted it, you would notice such huge timing error. That is very extreme. Can you hear a 1psec slow down? 100psec?
The science is there, and it is very solid and real. For audio the question is the impact of jitter on the ear. For instrumentation and medical the question may be “how accurate is the result”. For video, it may be about fuzzy picture, distortions coloration…
One can look at some "pictures" and explanations in my 1997 paper "On Jitter":
http://www.lavryengineering.com/white_papers/jitter.pdf
I may be deviating from the subject of the thread again. I will take some time to answer off topic question and comments addressed to on the Lavry Forum here at head-fi.
Regards
Dan Lavry
Lavry Engineering
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Dan, thanks fot the time you have taken to explain things.
Your post and your white paper should convince any sensible person that jitter exists and is measurable and it is not something that was "invented" by audio companies to fool audiophiles.
Your white paper is most interesting as you have measured the effect of both random and non-random jitter, and if I understood correctly your paper, random jitter is less harmful than non random jitter.
I hope that from now on, we have enough data so that everybody can make up their minds.
For those who still don't believe that jitter has an audible impact on our playback systems (I am referring to gevorg and nick_charles), I get their point but
please let other people express their experience about how different media players and usb to spdif converters sound in their system without being reminded every few hours that this is snake oil.
If someone has found that Amarra on Mac or Foobar in PC for instance has improved their listening experience, they should be able to express themselves without having to explain themselves.
While Dan Lavry (and others) have given us background information about jitter theory, this is not the sound science forum, and I hope people can stop posting about the fact that according to them no DBT test has proven what other people can hear.
Please read the following post before making new posts :
Do not discuss DBT in this or any other forums except the Sound Science forum.
