HDMI has now become a standard digital audio-video cable for connecting HDTVs with other audio-visual equipment. They have all connections integrated into a single cable. Unlike traditional connectivity options, HDMI cables greatly improve digital audio-video performance.
Due to the numerous advantages that HDMI offers, it has become an industry-supported specification. As the industry required a quality digital connection standard, the consumer electronics manufacturers decided to have a standard that would benefit both the consumer and the industry.
DVI or digital visual interface was the connectivity standard used previously. Effectively, HDMI is an enhanced version of DVI. In fact, HDMI specifications have been built on the DVI standards. An HDMI connector is also backward compatible with a DVI video input.
How HDMI cables are different
The HDMI cable incorporates all video signals. The earlier component cables included RGB (red, green, black) signals, while the component video or S-Video only carried video signals – audio signals were handled separately.
HDMI allows two-way communication between components. For instance, your HDTV can determine whether the picture from signal source is 4:3 or 16:9. This also allows the HDMI compatible unit to be controlled using a single remote control. So, when you push the play button of your Blu-ray player, it will start the HDTV, DVD playback and other audio components as well.