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HDMI Principle Analysis

HDMI is an All-digital interface used in both consumer electronics and PC. It can transmit uncompressed audio signals and video signals, because the audio and video signals using the same cable transmission, so greatly simplifying the number of interface cables, has been widely used in home appliances and PCs. The HDMI interface has evolved from HDMI 1.1 to HDMI 1.4 since the advent of the interface, although there has been no change in the appearance of the interfaces, but there has been a qualitative improvement in functionality and bandwidth. The mainstream HDMI interface version is HDMI 1.3 (A, B, c), but with the popularity of 3D video, HDMI 1.4 version of the equipment is also a large number of listed, become the focus of the promotion of the products. HDMI 1.4 brings several major innovations, including HDMI Ethernet channel, audio Return channel, HDMI 3D video playback, and 4k X 2 ultra high resolution support.

In the case of online cabling, HDMI has no previous version, such as HDMI 1.1 and HDMI 1.3 versions of the cables are the same, but in the HDMI 1.4 version, there are some changes in the cable. The HDMI 1.4 version contains 5 types of cables with different functional and performance characteristics. HDMI 1.4 version is divided into standard HDMI cable, standard attached Ethernet network function HDMI cable, car HDMI cable, high-speed HDMI cable, high-speed Ethernet network features HDMI cable five kinds. Standard HDMI cable is support for 1080p, high-speed HDMI support includes 4k X 2, 3D video, deep color and other advanced display technology, this cable is in fact the previous HDMI version 1.3, their bandwidth requirements in the HDMI version 1.3 can provide the bandwidth within. The high-speed Ethernet network features HDMI also has a dedicated data channel, which is to provide the network function between the devices of the HDMI Ethernet channel, the structure of the cable has changed, this will be introduced later. In the HDMI standard, it also specifies the certification labels for these five types of cables. We have also selected some of the cables labeled HDMI 1.4 in this sample, but have not been implemented in strict accordance with the HDMI standard.

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