HDMI, high-definition multimedia interface (English: high definition multimedia interface) is a digital video/audio interface technology that conforms to the standard of HD era, and can be used in set-top boxes, DVD players, personal computers and televisions.
the industry officially released the HDMI version 1. standard on December 9, 22, and the HDMI specification version 1.4a on March 4, 21. HDMI can transmit audio and video signals at the same time, and can transmit uncompressed high-definition video and multi-channel audio data with high quality, with the highest data transmission speed of 5Gbps.
at the same time, there is no need for line number/analog or analog-digital conversion before signal transmission. The HDMI specification can be matched with the Broadband Digital Content Protection (HDCP) to prevent the copyrighted audio-visual content from being copied without authorization.
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The advantages of HDMI are: only one HDMI cable is needed to transmit audio and video signals at the same time, instead of needing multiple wires to connect; At the same time, due to wireless digital-to-analog or analog-to-digital conversion, higher audio and video transmission quality can be achieved.
for consumers, HDMI technology can not only provide clear picture quality, but also greatly simplify the installation of home theater system because audio/video use the same cable.
HDMI is pin-compatible with DVI, but in a different package. Compared with DVI, HDMI can transmit digital audio signals, increase the support for HDCP, and provide better optional DDC functions.
HDMI supports a data transmission rate of 5Gbps, and can transmit up to 15 meters, which is enough for a 18p video and an 8-channel audio signal. In addition, HDMI supports EDID and DDC2B, so devices with HDMI have the characteristics of "plug and play", and the signal source and display device will automatically "negotiate" and automatically select the most suitable video/audio format.
Reference: Baidu Encyclopedia -HDMI