Common concepts of HDMI (High-Definition Multimedia Interface)

    HDMI is a comprehensive digital upgrade of the existing analog video standard.

     HDMI follows the EIA/CEA-861 standard, which defines the video format and waveform, the transmission mode of compressed and uncompressed audio (including LPCM audio), the processing of auxiliary data, and the implementation of VESA EDID. It is worth noting that the CEA-861 signal carried by HDMI is electrically fully compatible with the CEA-861 signal used by the digital vision interface (DVI), which means that when using a DVI to HDMI adapter, there is no need for signal conversion and no loss of video quality.

    In addition, HDMI also has the CEC (Consumer Electronics Control) function, which allows HDMI devices to control each other when necessary, so that users can easily operate multiple devices with a single remote control. Since the first release of HDMI technology, multiple versions have been launched, but all versions use the same cables and connectors. The newer HDMI version also provides more advanced features, such as 3D support, Ethernet data connection, and enhanced audio and video performance, capacity and resolution.

   The production of consumer HDMI products began at the end of 2003. In Europe, according to the HD Ready label specification jointly formulated by EICTA and SES Astra in 2005, HDTV TVs must support DVI-HDCP or HDMI interfaces. Since 2006, HDMI has gradually appeared in consumer high-definition TV cameras and digital static cameras. As of January 8, 2013 (the tenth year after the release of the first HDMI specification), more than 3 billion HDMI devices have been sold worldwide.