Computer Audio Asylum

RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec'

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audioengr

In Reply to: RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' posted by maabx on March 20, 2008 at 11:50:01

Yes, it is the only possible way that it stays synced. It must throw away samples. This is a feature of this particular receiver, and the DDDAC takes advantage of this. If the local clock is tuned fairly close to the stream source, then the drops are infrequent and probably not audible. If the stream and the local clock are different in frequency by say 1000PPM, then it may become audible IMO. This would be a missing sample about every second.

Follow Ups:

RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' - maabx 07:14:22 03/21/08 (2)
Steve, I realize that raw jitter numbers expressed in ps or ns mean nothing out of context. But, in your opinion, can you state what you believe to be the threshold level, above which, jitter can become audible? I don't mind if you want to put it into context, or whether it is stated in ps, ns or ppm. And I realize there have been studies on the matter. And that the studies are not consistent. But what is your opinion? I don't feel like I can hear jitter in my current setup, as I've heard it described many times.
- RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' - audioengr 11:32:09 03/21/08 (1)
  I have devices now with extremely low jitter. Cannot be measured on a scope at 3nsec per division. I have to believe that below 200-300psec it is pretty much inaudible in the very best systems on the planet. You have to understand that a system capable of discerning this is a world-class system with extremely low noise and sibilance. I believe only about .1% of systems in existence are in this league. Every component in the system, and the cables must be the very best, and modded not stock. No combination of stock components is capable of this level of performance IMO. When I do an A/B test of jitter, virtually every listener hears the difference. The effect is not subtle in an ultra-quiet system.
  
  If you are not hearing differences in jitter, you are not alone. Most systems have enough other noise and sibilance to drown it out.
  
  Steve N.
  - Thanks Steve. -t - maabx 14:42:29 03/21/08 (0)

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