The High Definition Multimedia Interface or HDMI is a digital alternative to standard analogue signals. HDMI cables can be used to connect digital video/audio sources like HD DVD players, AVCHD camcorders, Blu-ray players, video game consoles and personal computers with compatible digital audio-visual devices.
HDMI 1.4 is the latest version, some features are as follows:
Audio return channel (ARC)
The latest specification adds support for an audio return channel. This helps to minimise the number of cables needed to transmit audio signals. If the television set features an in-built content source, like a DVD player or a built-in tuner, ARC enables the TV set to transmit audio data through the HDMI cable. This eliminates the need to have an additional cable.
The addition of a data channel enables bi-directional, high-speed communication. Connected devices that feature an ethernet channel can easily send and receive 100 Mb/sec of data via this connection. This makes them ready for IP-based applications. The channel also allows sharing of an internet connection between internet-enabled HDMI devices.
Support for 3D
HDMI 1.4 specification allows support for 3D video applications and 3D gaming. The specification also standardises the output/input portion of the home 3D system. This facilitates dual-stream 3D resolutions of up to 1080p.
Resolution support up to 4K
The latest specification also allows high-definition multimedia devices to support high HD resolutions, almost four times the resolution of 1080p devices. This allows you to get the most from your Full HD TVs and other HD multimedia devices. Thus, it makes perfect sense to use HDMI cables for connecting different audio-visual devices.