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Concepts and Misunderstandings of HDMI Signal Transmitter and HD


High Definition Multimedia Interface (HDMI), which is a high definition multimedia interface, is a fully digital impression/sound transmission interface, capable of transmitting uncompressed audio and video signals. HDMI provides all compatible devices, such as on-board boxes, DVD projectors, personal computers, TV amusement instruments, induction enlargers, digital audio and television sets, a common material connection pipeline. HDMI can transmit audio and video signals together, because the same cable is used for audio and video signals, which greatly simplifies the device of the system. HDMI is planned to replace older analog audio and video transmission interfaces such as SCART or RCA terminals.


HDMI assists in various types of television and computer impression patterns, including SDTV, HDTV video pictures, plus multi-channel digital audio. During transmission, various video materials will be encoding into material packets by HDMI transceiver chips with "Transition Minimized Differential Signaling" (TMDS) skills. At the beginning of the specification, the transmission rate of the main picture element was 165 Mpx/sec, which was enough to assist 1080p picture quality with 60 pictures per second, or UXGA resolution (1600x1200). Later, it was expanded to 340 Mpx/sec in HDMI 1.3 specification to meet the needs of the future.

HDMI also assists non-compact 8-channel digital audio transmission, as well as any compact audio streaming such as Dolby Digital or DTS, as well as the 8-channel 1 bit DSD signal used by SACD. In the HDMI 1.3 specification, non-compact audio streaming with ultra-high material mass, such as Dolby TrueHD and DTS-HD, is added. HDMI allocator_http://www.lenkeng.com/

The standard Type A HDMI connector has 19 feet, and a Type B connector with higher resolution has been identified, but no manufacturer currently uses Type B connector. Type B connector has 29 feet, allowing it to transmit expanded video channels to meet future high-quality needs.

Type A HDMI can be downward compatible with Single-link DVI-D or DVI-I interfaces used by most displays and display cards today. This indicates that the signal origin of the DVI-D interface can drive HDMI screens through the conversion line, but this conversion scheme does not assist audio transmission and remote control functions. In addition, DVI screens without HDCP authentication will not be able to view video materials with HDCP encryption maintenance from HDMI. Type B HDMI connectors will also be downward compatible with the Dual-link DVI interface.


The originators of the HDMI signal transducer arrangement include major consumer electronics manufacturers, such as Hitachi, Panasonic, Quasar, Philips, Sony, Thomson RCA, Toshiba and Silicon Image. Digital Content Maintenance provides HDMI interface-related anti-copy maintenance skills. In addition, HDMI has also been supported by leading film manufacturers such as 20th Century Fox, Warner Brothers, Disney, major consumer electronics manufacturers including Samsung Electronics, as well as a number of cable television systems.

Briefly speaking, HDMI can overcome the problems of VGA, DVI and other interfaces, audio and video data can not be transmitted through a single line. HDMI standard connector uses a single line connection instead of the cluttered cables on the back of the goods. The cable with HDMI specification interface has no length restriction. For example: DVI cable length can not exceed 8 meters, otherwise it will affect the quality of the picture, and conform to the HDMI specification of the commodity is not in doubt. HDMI specification can deploy broadband digital content maintenance to avoid unauthorized copyright copying of audio and video content. HDMI can not only satisfy the resolution of 1080P with high picture quality, but also support the leading digital audio pattern such as DVD Audio, and support the transmission of 96kHz digital audio in octavocal channel or 192kHz stereo.

The use of HDMI on notebook is mainly suitable for the connection between notebook and flat panel TV. HDMI can use the strong disposal ability of notebook to transmit 1080P high-definition pictures and high-quality audio directly to flat panel TV, and then away from the difficulty of too small scale of notebook screen.


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