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Look for some expert info on HDMI/digital signals

post #1 of 7
Thread Starter 
Hi folks, I'm writing up some information about how to not get ripped off when purchasing HDMI cables and I just wanted to verify that my information is correct.

I've got a section about not being fooled by "component-speak" as in: companies trying to say (about their HDMI cables) "our cables are gold-played and offer the deepest blacks and the sharpest pictures".

(this is the part that I want to verify is accurate -->) Correct me if I'm wrong, but this isn't truthful of them as HDMI cables deal exclusively with digital signals which are not impacted by the quality of the conductors and or what the cable is made out of (as long as the signal gets from one end to another). As long as the spec is the same, you'll get the same image/sound quality from a $2 HDMI cable as a $100 HDMI cable.

Thanks for your time and expertise!
Edited by Benz145 - 5/22/11 at 3:36pm
    
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post #2 of 7
as far as i know...true gold plated connectors can offer a slighty better connection over a cheaper or regular connector. but other than that...a hdmi is an hdmi. as long as it's a true certified hdmi cable..then it's all equal.
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post #3 of 7
i think the only difference is the "higher quality" cables may be able to run longer distances but that should be about it
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post #4 of 7
Indeed, if the signal is transmitted from A to B with no problems then it is at its maximum possible quality. Say I was to use a low quality cable, and it caused the received voltage to drop a little ( unlikely, but for talks sake) the signal is still interpreted as a 1 by the monitor. The system that controls the actual pixels is effectively an entirely separate circuit to the input circuit therefore unaffected by input signal quality. It's a simple way to look at it, but you get the idea.
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post #5 of 7
HDMI cable is nothing more than an arrangement of wire, foil and plastic. Seriously

1080p certification-->There's no such thing.

Support for new audio formats, such as Dolby TrueHD
cables have nothing to do with it.

Speed Rated HDMI
Apart from two official speed ratings, "standard" (Category 1) and "high" (Category 2), as defined by HDMI Licensing, there are no other official speed rating standards for HDMI. Some resellers of Chinese HDMI cables at crazy-high prices mark their cables with bogus speed ratings. If there's a speed on it stay awaaaaaay

Support for x.v.YCC colorspace
Like support for Dolby TrueHD, a good thing; but, just as with Dolby, supported equally by all HDMI cables regardless of type, spec version or anything else.

Support for other specific resolutions, features and protocols
With the exception of the new Ethernet and audio return channel feature, whether it's 2K by 4K video, Deep Color, or what-have-you, support for these features depends entirely on the cable's rated speed and the impact of the particular feature on the bitrate, not on the nature of the feature.

20Hz or 240Hz support
No set-top device emits an HDMI signal at these framerates, though the Sony PS3 and any PC has the potential. Rather, a display labeled "120Hz" or "240Hz" has an internal frame-refresh rate as stated. It's completely irrelevant to the HDMI cable or to the signal the HDMI cable carries.

First-generation HDMI cables were designed with 1080i and 720p video in mind, at eight-bit color depth. Both of these resolutions require a clock rate of 74.25 MHz, and 742.5 Mbps per data channel in the HDMI signal, and originally (through HDMI specification 1.2), this is what HDMI cable compliance testing was targeted at. With HDMI specification 1.3, however, the single-link bandwidth limit per data channel was raised to 3.4 Gbps, to accommodate such things as deep color and higher framerates, and from what we've already said above it should be clear that a cable which works fine at 742.5 Mbps will not necessarily work at a data rate which is over four times as fast

http://www.audioholics.com/education...mi-cable-speed
post #6 of 7
It's mostly from companies such as Monster who genuinely had better analogue cables (Though maybe not the most price-efficient, they're the Bose of the cable world) than your cheap cheap cheap stuff, but, now that every digital cable's the same they "enhance" the truth to avoid going out of business. You'll never actually see "Our digital cables give a better picture" - You'll see "Our cables are of a higher quality than your cheap ones" - which is true, they are better built, but you'd have to break fifty cables to account for one monster cable.
post #7 of 7
In short its not the cable but what's at the other end of it. Its not going to make something faster
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