High Definition Multimedia Interface (HDMI) is a kind of interface standard with both high definition digital video and digital audio transmission capability, which is a special digital interface suitable for image transmission, and can also transmit audio and image signals at the same time, with the maximum data transmission speed of 48 Gbps.At the same time, the digital/analog or analog/digital conversion is not needed before signal transmission. HDMI cable is an all-digital video and audio transmission line, which can be used to transmit audio and video signals without any compression, providing bandwidth support for 2K/60Hz, 4K/60Hz, 8K/60HZ and higher resolution; Supports 3D, HDR and Ethernet, voice feedback function. It is mainly used for video and audio signal transmission of plasma TV, HD player, LCD TV, rear projection TV, projector, DVD recorder/projector, D-VHS recorder/projector and digital video and audio display device. HDMI cable has the advantages of small size, high transmission rate, wide transmission bandwidth, good compatibility, and can transmit uncompressed audio and video signals at the same time. Compared with the traditional full analog interface, HDMI not only increases the convenience of equipment interconnection, but also provides some unique intelligent functions of HDMI.