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in HDMI standard at the beginning, did not abandon the standard part of a relatively mature technology and is easy to realize the DVI standard. The entire transmission principle is still based on Image TMDS's Silicon encoding technology. As for the various defects of the DVI interface, HDMI were significantly improved, mainly reflected in the following aspects:

* better anti-jamming performance, can realize gain transmission without the 20 meter long.

* for large size digital flat-panel TV resolution optimization, good compatibility.

* EDID (1) and DDC2B (2) standard, intelligent connection can select the best matching between devices.

* has strong copyright protection mechanism (HDCP), effectively prevent the phenomenon of piracy.

* support 24bit deep color processing, (RGB, YCbCr4-4-4, YCbCr4-2-2).

* interface has the advantages of small volume, various devices can be easily installed.

* a cable, digital audio and video synchronization signal transmission, effectively reducing the use cost and complexity.

* fully compatible with standard DVI interface, users do not have to worry about the old and new systems do not match.