What is HDMI

Is a kind of full digital image and sound transmission of audio and video signalinterface, can send uncompressed. HDMI can be used for set top box, DVD player,personal computer, video game console, integrated amplifier, digital audio andtelevision equipment. HDMI can also send the audio and video signal, the audio and video signals using the same cable, which greatly simplifies the installation difficulty system line. HDMI was designed to replace the analog video transmission interfacesuch as SCART or RCA of the old terminal. It supports all kinds of TV and computerimage formats, including SDTV, HDTV video screen, plus multi-channel digital audio.In the transmission, various video data will be hdmi extension cable transceiver chip to "transmission minimized differential signal" (TMDS) technology is encoded into data packets. At the beginning of the formulation of specifications when the maximum pixel transmissionrate of 165Mpx/sec, enough to support the 1080p image quality of 60 frames per second picture, or the resolution of the UXGA (1600x1200); later in the HDMI 1.3 specification amplification for 340Mpx/ seconds, to meet the needs of the futurepossible. vga extension cable also supports non transmitting compressed digital audio (8 channelsampling rate of 192kHz, 24bits/sample data length), as well as any compressed audio stream such as Dolby Digital or DTS DSD signal, 1bit also support SACD by the use of 8 channel. In the HDMI 1.3 specification, adding ultra high data volume of non compressed audio stream such as Dolby TrueHD and DTS-HD support. Type Astandard HDMI connector 19 pin connector, Type B another support higher resolutionis defined, but there is still no manufacturers using the Type B connector. Type Bconnection has 29 pins, video channel to allow its transmission expansion to meet future high quality requirements, such as WQSXGA (3200x2048). Type A HDMI can be down compatible in the use of nowadays most display and graphics of Single-linkDVI-D or DVI-I interface (but does not support DVI-A), the said signal source using DVI-D interface can drive vga cable  screen by converting the line, but the conversionscheme does not support audio sending and remote control function. In addition, if there is no HDCP certification DVI screen will not be able to watch the video data withHDCP encryption to protect the output from the HDMI. (all HDMI screen all support HDCP, but most of the DVI interface display does not support HDCP.) Type B HDMI connector will also be downward compatible with Dual-link DVI interface.