HDMI Cable comparisons
Here is an older thread, but it has good technical info on jitter and HDMI. I'll post a link to page 3 which contains the most relevant info, but it is a great thread overall for info on jitter in general. http://www.avsforum.com/avs-vb/showthread.php?t=908665&page=3 |
Jkalman, Thanks for the links. It seems to corroborate my statement that interface jitter is a well known problem when devices are synchronized using a clock signal - or am I missing something? The way I see it, a long run of HDMI cable might behave differently from a short run. I agree that good quality equipment should effectively handle the interface jitter in both cases to the point that either cable is indistinguishable to the ear in double blind tests. I was only trying to point out that in some cases of borderline equipment performance then an audible difference "might" occur. I realize some authors have suggested that as much as 20 ns is necessary for jitter to become audible and since there are infinite forms of jitter the debate may never be resolved, however, it is easy to show that certain forms of signal correlated jitter will indeed rise above the noise floor at 100 psec on very high quality gear (whether this is audible or not - this simple fact has a tendency to cause concern because S/N is such a standard specification in our industry and modern electronics has incredible S/N performance). |
I was only trying to point out that in some cases of borderline equipment performance then an audible difference "might" occur. Not in the context of $100+ (or even $50+) HDMI cables vs. $20 HDMI cables of the same length and gauge. If the cables have the same gauge and length, they will behave the same... You don't have to pay excessive amounts of money to get the same gauge and length as some companies that charge $200+. The jitter is going to be the same amount in both cables, yet you are insinuating someone should pay more for one digital than the other because it "might" be different. It isn't different... So don't pay more for a cable to get an imaginary benefit. That thread I pointed out to you also mentions that jitter is eliminated at several places in the receiving end before the signal is turned into analog (though there was some questioning of buffer size needed to prevent overrunning the buffer). Plus there were links to pages that provide DBTs with jitter. It really is a non-issue now a days at the levels these preprocessing units function at... |
Shadome / Jkalman- guys; take a break, just go here. http://www.audioholics.com/education/cables/long-hdmi-cable-bench-tests. Russ |
