jerryC:
Since it seems that reviewers and some tech people think there are subtle differences with things like HDMI cables and HDMI amplifier inputs, which seem to go beyond just a lower of higher error rate(1) It'd be fascinating to see an article by one of the engineers explaining mechanisms that can cause this. With analog signals, it's easy to see various possible causes for subtle differences between different bits of equipment. For the purely digital bits, it's hard to see how you can do anything other than increase the bit error rate, which ought to give a range between 'perfect' and 'totally trashed' - but shouldn't be able to do *different* subtle things to video or audio since the digital transport stages don't know what the bits mean or how they relate to later bits.
If an engineer could come up with a mechanism that explained _how_ you could get different subtle effects, it would make a very interesting article.
(1) I have no problem believing that some HDMI cables work better than others, especially for longer ones. What I don't understand is how you could achieve some of the more subtle differences reported; doesn't mean the differences aren't there, but if they are, it should be possible for an expert to come up with an explanation that explains how it could happen
which would make me a lot happier.
I also struggle with this as I posted elsewhere. Here's what one high quality cable manufacturer has to say on the subject of HDMI -
"Unlike analog cables, DVI and HDMI video cables will usually either be 100% perfect, or have obvious problems that make them unusable, that is to say that their acceptability is also "digital". Analog signals can suffer from a wide variety of subtle problems that can additively result in a visible but unacceptable picture."
http://www.dvigear.com/documents/DVIGear_HDMI_1.3_Cables_-_A_Look_Under_the_Hood_v2.pdf
It really does make be ponder the credibility of reports that describe noticeable differences in colour, motion, sharpness etc due to different (even short length) HDMI cables. Like you I do not believe all cables are manufactired to the same standard but I would also welcome an article on how the subtle differences described in the reviews are possible. Maybe some simple example tests from WhatHiFi? that we can try at home that show these differences.
AVI