HDMI which stands for High-Definition Multimedia Interface is a system developed for transmitting uncompressed digital signals between a host of compatible audio video devices. The HDMI to DVI cable was introduced late in 2003 around about the time that High Definition Television was becoming popular.
This cable is capable of connecting DVD players, set-top boxes, Play Stations, Xboxes and Audio Video receivers to HD televisions, computer monitors and countless other AV devices.
On one cable, any PC or TV video format can be supported. This includes up to eight channels of uncompressed or compressed digital audio and a CEC (Consumer Electronics Control) connection. This CEC connection has the capability of allowing various high definition devices to control one another and gives the user the ability to operate several devices using only one remote control.
Due to the fact that HDMI is compatible electrically with DVI (Digital Visual Interface), there is no need to convert the signal. There is also no degradation of the quality of the video when using the connecting cable. The high definition standard has all but replaced such diverse standards as composite video, coaxial cable, SCART, S-Video, VGA and D-Terminal.
This interface is rapidly becoming the de facto connection standard for HDTV's and according to the electronic market intelligence group In-Stat, about 90 percent of the digital television sets produced in 2007, included the connector. In-Stat also estimated that in 2008 about 229 million of the devices had been sold and the estimate for 2009 was 394 million with the prediction that by the end of 2009 all digital television sets would be fitted with at least one of these connectors.
The connector is manufactured in four different types, namely A, B, C and D. Type A has nineteen pins and is compatible with DVI-D. Type B has 29 pins and will transfer double the bandwidth of the Type A. Type C has a mini connection with 19 pins like the A type and was designed for portable equipment. Type D is a micro connector also with 19 pins but the plug has been shrunk to look more like a micro-USB one.
There are several versions of the HDMI standard with each version being allocated a number. Currently versions 1.0 to 1.2, 1.3 and 1.4 are available with all of the versions using the same cable but having increased bandwidth and capabilities for each subsequent version number. Although a maximum length for the cable has not been specified, resistance in the cable and the way it has been manufactured together with the materials used, places a limit on usable lengths. HDMI to DVI cable is currently manufactured in lengths ranging between 5 and 15 meters.
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