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.
What are the differences between HDMI versions? 1.3 adds additional bandwidth for handling more complex audio and video. However, 1.2 has enough bandwidth to support all current audio and video standards. The a and b versions of 1.2 and 1.3 use different ways of testing the data transfer; this does not affect compatibility or quality of the data. What's the difference between a "Standard" and "High-speed" cable? A standard cable is tested for use up to 75Mhz (version 1.2,)while a high-speed cable has been tested to 340Mhz (1.3.) This does not mean a standard cable can't reach 340Mhz, it just hasn't been certified at these speeds. The price for both types of cable are about the same, so you may as well buy high-speed cable.
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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