(
High-
Definition
Multimedia
Interface) A digital interface for audio and video that provides a single-cable solution for home theater and consumer electronics equipment such as TVs, Blu-ray/DVD players and set-top boxes. Introduced in 2002, one HDMI cable took the place of nine different analog audio and video cables.
HDMI supports eight channels of 24-bit uncompressed audio at 192kHz and 4K video resolution up to 4096x2160 (as of HDMI 1.4). It also provides copy protection, A/V equipment control, 5 volts of power and compatibility with DVI and DisplayPort interfaces. For more HDMI details, look up the following:
Version summary, see
HDMI versions.
Cable versions, see
HDMI cable types.
A/V control, see
HDMI CEC.
Compatibility, see
HDMI-DVI compatibility and
DisplayPort.
Audio return channel, see
HDMI ARC.
Copy protection, see
HDCP.
Common 19-Pin Connectors
Type A is for TVs and home theater equipment, while camcorders and cellphones use Type C and D. A more secure Type E is used in vehicles, and a 29-pin Type B supports dual-link DVI resolution (see
DVI).
HDMI vs. All the Others
This earlier Roku streaming hub was on the market during the transition stage from analog to digital TV. See
A/V ports.
An HDMI Switch
HDMI switches let several HDMI sources plug into a TV with only one HDMI input. This Oppo unit switches three inputs. See
HDMI switch.
(Image courtesy of Oppo Digital, Inc., www.oppodigital.com)