HDMI

High-Definition Multimedia Interface (HDMI) is a proprietary audio/video interface for transmitting uncompressed video data and compressed or uncompressed digital audio data from an HDMI-compliant source device, such as a display controller, to a compatible computer monitor, video projector, digital television, or digital audio device.[3] HDMI is a digital replacement for analog video standards.

HDMI (High-Definition Multimedia Interface)


Male HDMI connector
Type Digital audio/video/data connector
Production history
Designer
HDMI Forum (83 companies)[2]
Designed December 2002; 19 years ago (2002-12)
Manufacturer HDMI Adopters (over 1,700 companies)
Superseded DVI, VGA, SCART, RGB Component
General specifications
Width 13.9 mm (type A), 10.42 mm (type C), 6.4 mm (type D)
Height 4.45 mm (type A), 2.42 mm (type C), 2.8 mm (type D)
Hot pluggable Yes
External Yes
Audio signal LPCM, Dolby Digital, DTS, DVD-Audio, Dolby Digital Plus, Dolby TrueHD, DTS-HD High Resolution Audio, DTS-HD Master Audio, MPCM, DSD, DST, Dolby Atmos, DTS:X
Video signal Maximum resolution limited by available bandwidth
Pins 19
Data
Data signal Yes
Bitrate Up to 48 Gbit/s, as of HDMI 2.1a
Protocol TMDS, Fixed Rate Link (FRL)
Pinout
HDMI type A receptacle
Pin 1 TMDS Data2+
Pin 2 TMDS Data2 Shield
Pin 3 TMDS Data2−
Pin 4 TMDS Data1+
Pin 5 TMDS Data1 Shield
Pin 6 TMDS Data1−
Pin 7 TMDS Data0+
Pin 8 TMDS Data0 Shield
Pin 9 TMDS Data0−
Pin 10 TMDS Clock+
Pin 11 TMDS Clock Shield
Pin 12 TMDS Clock−
Pin 13 Consumer Electronics Control (CEC)
Pin 14
Pin 15 SCL (I2C serial clock for DDC)
Pin 16 SDA (I2C serial data for DDC)
Pin 17 Ground (for DDC, CEC, ARC, and HEC)
Pin 18 +5 V (up to 50 mA)
Pin 19
  • Hot Plug Detect (all versions)
  • HEAC− (HDMI 1.4+, optional, HDMI Ethernet Channel and Audio Return Channel)

HDMI implements the EIA/CEA-861 standards, which define video formats and waveforms, transport of compressed and uncompressed LPCM audio, auxiliary data, and implementations of the VESA EDID.[4][5]:p. III CEA-861 signals carried by HDMI are electrically compatible with the CEA-861 signals used by the Digital Visual Interface (DVI). No signal conversion is necessary, nor is there a loss of video quality when a DVI-to-HDMI adapter is used.[5]:§C The Consumer Electronics Control (CEC) capability allows HDMI devices to control each other when necessary and allows the user to operate multiple devices with one handheld remote control device.[5]:§6.3

Several versions of HDMI have been developed and deployed since the initial release of the technology, but all use the same cable and connector. Other than improved audio and video capacity, performance, resolution and color spaces, newer versions have optional advanced features such as 3D, Ethernet data connection, and CEC extensions.

Production of consumer HDMI products started in late 2003.[6] In Europe, either DVI-HDCP or HDMI is included in the HD ready in-store labeling specification for TV sets for HDTV, formulated by EICTA with SES Astra in 2005. HDMI began to appear on consumer HDTVs in 2004 and camcorders and digital still cameras in 2006.[7][8] As of January 2021, nearly 10 billion HDMI devices have been sold.[9]


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