The role of audio and video matrix

In modern multimedia conference room , in order to meet the needs of different occasions demonstrated , usually with a variety of different audio and video sources and display terminal ,lcd graphic display modules although these audio and video sources and display terminal may also have composite video (Composite-Video) , S-video (S-Video), component video (Component-Video) or digital video (DVI, SDI) interface, but now in the multimedia video conferencing are still commonly used composite video matrix , the main reason in the following few areas:
· Composite video with good stability, compatibility and versatility , the transmission bandwidth is small , the transmission distance is long . But chrominance and luminance share 4.2MHz (NTSC) or 5.0 ~ 5.5MHz (PAL) frequency bandwidth between each other a relatively large crosstalk , equipment and transmission cable on the requirements of the standard is not high , the signal source rich , embedded cable lower investment .
· Super Video (S-Video) While in reducing loss of brightness , brightness / chroma crosstalk significantly better than composite video , but for now common LCD projectors , DLP projectors and reach a very significant difference, and embedded composite video cable is double the investment , so long-distance transmission projects not widely used.
· Component video signal format has been significantly higher than the level of the composite video or S-video , but mostly in the conference room for the computer display (VGA or RGBHV signal format ) services, equipment and transmission cable is demanding ( depending design standards and the expected investment budget ) , embedded cable investment is very high.
· Similarly Y, RY, BY, Y, Cr, Cb component video signals currently mainly used in the broadcasting industry , and will gradually SDI or HD-SDI digital signal format transition , due to the signal source and the capital budget constraints, meeting room using much. DVI signals due to the effective transmission distance ( 5 meters ) , and is currently not widely used .
Summing up the classification , mini lcd module it is customary audio and video matrix are not particularly specified default composite video format. Composite video output format to the main equipment: cameras, physical booth , cable modem, remote video conferencing , video tape recorders , DVD players , etc., audio and video matrix systems intermediary in the video source and the display terminal or reuse Rooms, responsible for different audio and video signal source according to the user's wishes for centralized control .