HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transferring uncompressed video data and compressed/uncompressed digital audio data from a HDMI-compliant device ("the source device") to a compatible computer monitor,video projector, digital television, or digital audio device.[1] HDMI is a digital replacement for existing analog video standards.
There are a large number of HDMI-standard cable connectors available, each of which can be used for any uncompressed TV or PCvideo format, including standard, enhanced,high definition, and 3D video signals; up to 8 channels of compressed or uncompressed digital audio; a CEC (Consumer Electronics Control) connection; and an Ethernet data connection. HDMI implements the EIA/CEA-861 standards, which define video formats and waveforms, transport of compressed, uncompressed, and LPCM audio, auxiliary data, and implementations of the VESA EDID.[2][3]
The CEC allows HDMI devices to control each other when necessary and allows the user to operate multiple devices with oneremote control handset. Because HDMI is electrically compatible with the CEA-861 signals used by 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] As an uncompressed CEA-861 connection, HDMI is independent of the various digital television standards used by individual devices, such as ATSC and DVB, as these are encapsulations of compressedMPEG video streams (which can be decoded and output as an uncompressed video stream on HDM). Production of consumer HDMI products started in late 2003. In Europe either DVI-HDCP or HDMI is included in theHD ready in-store labeling specification for TV sets for HDTV, formulated by EICTA with SES Astra in 2005. HDMI began to appear onconsumer HDTV camcorders and digital still cameras in 2006. As of January 8, 2013 (ten years after the release of the first HDMI specification), over 3 billion HDMI devices have been sold.[
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