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An HDMI cable is used to connect a video device with an HDMI output to a Plasma, LCD TV, Surround Sound Processor or projector with an HDMI input. HDMI cables transfer the audio and video signal digitally, this means the picture will look identical which ever HDMI cable you use, providing the cable is capable of transmitting the signal without too much loss. An HDMI cable with too much loss will be immediately obvious as the picture will look like it has white dots all over it, referred to as 'sparklies'.
Some HDMI cables are graded by the HDMI specification they have been tested to, the latest specification HDMI 1.3a calls for cables to be graded as Cat 1 or Cat 2 depending upon the data rate they can support. HDMI 1.3 Cat 2 cables are just appearing and will support resolutions of 1440p and 2160p. Most users require nothing more than an HDMI 1.1 cable and many HDMI 1.1 and 1.2 cables (especially shorter lengths) would be graded 1.3 cat 1 had they been tested to the specification. There is no difference in pin wiring between HDMI cable versions, the HDMI changes refer to feature changes that are implemented in the video equipment.
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