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The action of phonic video matrix and design technology point are analytic
From;    Author:Stand originally

1.The action of phonic video matrix

In contemporary multimedia assembly room, differ to satisfy the demand that demonstrates a circumstance, the cause of phonic video signal that can have a variety of differring normally and indication terminal, although sources of these phonic video signal are mixed,indication terminal also may have compound video at the same time (Composite-Video) , super video (S-Video) , heft video (Component-Video) even digital video (DVI, SDI) interface, but inspect the matrix of is used generally compound still video in resembling the conference in multimedia at present, main reason is in as follows a few respects:

·Compound video has good stability, compatibility and versatility, transmission bandwidth is small, transmission distance is long. But chroma and brightness share 4.2MHz (NTSC) or 5.0~5.5MHz (PAL) frequency bandwidth, mutual between have string of bigger trouble, not tall to the requirement standard of equipment and transmission line cable, signal source is rich, bury wire cable beforehand investment is inferior.

·Super video (S-Video) although reducing brightness loss, brightness / chroma strings together faze respect apparent excel is compound video, but to current and common liquid crystal projector, DLP projector and the distinction with very clear short of, and double burying wire cable to invest beforehand is compound video, transmit in project Sunday run so did not get general use.

·Heft video is already apparent on the level of signal format prep above is compound video or super video, but be in at present assembly room majority is to be computer to show (VGA or RGBHV signal format) service, very tall to the requirement of equipment and transmission line cable (depend on expectant design level and investment budget) , bury wire cable beforehand investment is very high.

·Similar Y, r-Y, b-Y, Y, cr, the heft video signal of Cb basically applies in wide cable industry at present, and can transfer to the digital signal format of SDI or HD-SDI gradually, because signal source and capital are estimated,restrict, assembly room is used not much. DVI signal is restricted as a result of what transmit a distance effectively (5 meters or so) , did not get applied extensively at present.

Appraise of the place on put together, video matrix did not make clear customarily sound particularly to acquiesce is compound video format. The main equipment that exports with compound video format has: Xing of ⒂ of ā of solid of neptunium of drop of ⑹ of Lang Tiao  knocks at Li to chant aspic of ⒃ of badger kneecap a huge legendary turtle to drip machine of smooth dish of VD of  of  of Tiao of cangue of  of glutinous of ⒋ of Luo of Mei of Tiao of the tenth of the twelve Earthly Branches, phonic video matrix is in systematic intermediary at video source and show or answer with terminal between, be in charge of source of will different phonic video signal undertaking centralized adjusting control by the apiration of the user.
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