So how do you solve HDMI problems? “When you need to troubleshoot, the best tool of all is the old noggin,” says Jeff. The video can be perfect, but if the DDC line has rise-time issues, the unit will not pass HDCP, and no picture will be displayed.” Possible results are “failures such as no audio, no picture, pink screen or flashing – it has nothing to do with the high-speed data lines. You can have all the high-speed data bandwidth in the world, but without DDC, you’re dead in the water.” If capacitance gets to a critical point, it slows the signal ‘rise time’ needed for proper communication. “I2C is slow, but very susceptible to stray capacitance issues from connectors, cables or anything the electrical bus is connected to. “The majority are issues with I2C, the serial protocol used on the DDC line for EDID (Plug and Play) and HDCP (high Bandwidth Digital content Protection). So what problems does HDMI regularly encounter? “Many problems have nothing to do with high-speed video,” says Jeff. “Even high-priced products didn’t necessarily yield higher performance as the video bandwidth is so large, and dependence on control channels made the interface vulnerable.” It was pretty obvious that while many products passed HDMI compliance testing, a high percentage were at the lower end of the performance scale.” “We learned early on that HDMI had some reliability issues limiting its use. “HDMI requires a completely new set of rules and different techniques for success,” he says. Jeff Boccaccio’s Florida-based company DPL Labs runs the Digital Performance Level program, intended to help manufacturers, retailers and customers test and rate HDMI products. In fact, when you mix-and-match HDMI source devices, cables, accessories and displays from different manufacturers, it’s almost certain that you’ll hit trouble and with the complex digital nature of HDMI, it can be impossible for consumers to resolve the issues. It’s a myth that as HDMI cables carry digital data in the form of a stream of 0s and 1s, they will all function flawlessly, all the time, regardless of cost or construction. The latest version, 1.4, was announced in March 2010 and is now commonly found on Blu-ray players and AV amplifiers, but will it finally solve our problems? Lots of customers could answer that, as connection problems, hardware incompatibilities and confusing upgrades have blighted the progress of HDMI. The whole AV industry agreed on the standard, and manufacturers adopted it with enthusiasm. HDMI, the High Definition Multimedia Interface, was planned as the solution to all our hi-def interconnection problems a single cable to carry high-definition video, high quality multichannel audio, and control codes.
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