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The High-Definition Multi-media Interface (HDMI) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI provides an interface between any compatible digital audio/video source, such as a set-top box, DVD player, and A/V receiver and a compatible digital audio and/or video monitor, such as a digital television (DTV).

HDMI supports standard, enhanced, or high-definition video, plus multi-channel digital audio on a single cable. It transmits all ATSC HDTV standards and supports 8-channel digital audio, with bandwidth to spare to accommodate future enhancements and requirements.

A high-bandwidth version of the standard 19-pin Type A HDMI connector, called Type B, has been defined, although it is not yet in common use. This has 29 pins, allowing it to carry an expanded video channel for use with high-resolution displays.

Type A HDMI is backwards-compatible with the single-link Digital Visual Interface (DVI) used on computer monitors and graphics cards. This means that a DVI source can drive an HDMI monitor, or vice versa, by means of a suitable adapter or cable, but the audio and remote control features of HDMI will be unavailable. Type B HDMI is similarly backwards-compatible with dual-link DVI.

The HDMI Founders include leading consumer electronics manufacturers Hitachi, Matsushita Electric Industrial (Panasonic), Philips, Sony, Thomson (RCA), Toshiba, and Silicon Image. Digital Content Protection, LLC (a subsidiary of Intel) is providing High-bandwidth Digital Content Protection (HDCP) for HDMI. In addition, HDMI has the support of major motion picture producers Fox, Universal, Warner Bros. and Disney, and system operators DirecTV, EchoStar (Dish Network) as well as CableLabs.

Table of contents
1 Technical Specifications
2 Web site
3 See also

Technical Specifications

TMDS channel

DDC channel

Consumer Electronics Control (CEC) channel (optional)

Content Protection

Connector Detail

Connector example: Molex 500254-1907

Type A Connector Pin Assignment
Pin Signal Assignment Pin Signal Assignment
1 TMDS Data2+ 2 TMDS Data2 Shield
3 TMDS Data2– 4 TMDS Data1+
5 TMDS Data1 Shield 6 TMDS Data1–
7 TMDS Data0+ 8 TMDS Data0 Shield
9 TMDS Data0– 10 TMDS Clock+
11 TMDS Clock Shield 12 TMDS Clock–
13 CEC 14 Reserved (N.C. on device)
15 SCL 16 SDA
17 DDC/CEC Ground 18
5V Power
19 Hot Plug Detect

Web site


See also

Digital Visual Interface (DVI)