An HDMI cable is high definition multimedia interface, this cable can carry signal for audio and video inside one cable which makes for simpler connections. To use analog connectors would take nine individual cables to equate what the HDMI can handle. HDMI is capable of 1080p video, that's sixty frames a second, which is currently the highest video standard; and on audio it handles eight channel of 24 bit 192Khz which is enough for Dolby TrueHD and DTS-HD, the two highest standards in audio. HDMI can also enable devices to communicate which helps setups. Such as when you connect a game system to the TV, the game system is able to tell the television the mode of video it's using so the TV can set itself automatically for the right resolution. HDMI is also backward compatible with DVI, there are easy cables and adapters for connecting DVI and HDMI electronics together.
What's Mini-HDMI? Like Mini-USB, this smaller form factor uses the same pin-out as regular HDMI. It's seen mainly on portable devices like digital camcorders where space is at a premium, and be connected to a normal HDMI port using an adapter or Mini-HDMI to HDMI cable.
There are different versions of the HDMI format, the 1.3 version has more bandwidth and so is able to accommodate more complex video and audio, but version 1.2 supports everything that is currently out there. Then there are a and b versions of each with the testing being different but no impact on the compatibility. There are also HDMI's called Standard and High speed, the standard is the version 1.2, it goes to 75Mhz, and the High speed is version 1.3, going to 340Mhz. Now your standard may be able to get to 340Mhz but it's just not certified for that, with prices similar go ahead and choose the High speed HDMI.
There is only one difference between high grade HDMI cables and regular HDMI cables, and it's price, approximately $30-$40. With the digital format there is no degradation or interference of the signal like you get with analog cables, either you have the signal or you don't. Thirty three feet is the current standard length for HDMI constructed of plain copper wire, but longer ones will work well even without adding a signal repeater.
Closed captioning does still work when you implement HDMI, the digital televisions have the closed captioning supported by the receiver not the television. For the captioning to function it has to be turned on from the source component such as the cable box. Then the HDMI moves the video data with the captioning as already part of the image, not separate video and captioning data like it was done previously.
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