The cable is able to connect most set-top boxes, Xboxes, Play Stations and DVD players as well as Audio Video type receivers to computer monitors, HDTV's and other consumer AV equipment.
Using a single cable, support is available for video formats on any TV or PC and as many as eight compressed or uncompressed channels of digital audio, plus a Consumer Electronics Control (CEC) connection. A CEC connection will allow HDMI equipment to be controlled by each other and to operate a number of different devices with a single 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.
The interface is on its way to becoming the accepted standard for inclusion on all HDTV's and In-Stat, a marketing intelligence company, has claimed that the interface was fitted to approximately 90 percent of digital TV's in 2007. Another estimate by In-Stat was that during 2008 around 229 million were sold while in 2009 the updated estimate was 394 million with a further prediction that all TV sets would have one of these connectors at least, by the end of 2009.
The connector has four distinct types, which are named A, B, C and D. The A type has been designed with nineteen pins. It is compatible with the single link DVI-D standard. The B type's design supports 29 pins and carries twice the video bandwidth supported by Type A. The design of Type C reverts to the nineteen pin format but has been modified for use with portable equipment. Type D is also a nineteen pin connector but it is a micro type and its reduced size looks more like a micro-USB connector.
Several versions of the HDMI standard are in production and each one has been given a number. At present, versions 1.0 to 1.2, 1.3 and 1.4 are being used and all of them use the same cable with the transmission bandwidth and capabilities being upgraded for each version. A specification for maximum cable length has not been established but the materials used and the method of manufacture are limiting factors to practical cable lengths. HDMI to DVI cable is currently available in 5 to 15 meter lengths.
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