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The structure of video conference system and industry run a level
From;    Author:Stand originally
One, the classification of video conference system

1. orders bit righter video conference system

Major servicing has: System of system of conference of video of picturephone, desktop, conference of assembly room video.

System of conference of video of 2. much dot

The participant that system of conference of many bits of video allows 3 or 3 above select differently participates in the conference at the same time. Department of conference of many bits of video integrates a crucial technology is problem of many bits of control, many bits of control is unit (MCU) the video that controls each aspects on communication network, frequency, current data and the flow direction that control signal, the person that make attend the meeting can receive the corresponding video, information such as frequency, maintain conference on the rails.

2, the standard of video conference system

It is main by many bits of video conference terminal, controller, channel (network) reach composition of control management software. The main function of terminal of video conference system is: Of signal of number of frequency of processing of the collection of signal of the video that finish, editor and processing of the indication output, collection of frequency signal, editor and output, video compress encode and decipher, the compression that accords with international standard the code sheds longitudinal road interface to send channel finally, or in reducing the level the code to shed longitudinal road interface send terminal from channel. In addition, terminal forms all sorts of control information of communication even: Synchro control and demonstrative signal, far end regulations of structure of frame of the control agreement of camera, definition, call and the call of many terminal regulations, add close standard, deferent the administrative level of close spoon and close spoon.

1.H.320 series standard
H.320 series standard is the application in conference system the earliest, most mature agreement, support ISDN, e1, t1, bandwidth arrives from 64Kbps 2Mpbs, manufacturer of system of almost all conference supports.
H.320 series standard included video, the compression of frequency reconciles compress, freeze framing, many bits of conference, add reach a few improvement character closely. H.320 can divide for 5 parts: Current system, frequency, many bits of conference, add close, data is deferent wait. Include 15 levels at present. H.221 multichannel answer with / solution answer serves channel frame structure with definition 64k-1920k seeing and hearing the join mechanism of different media, the synchronism on space and time returns model. H.261 video encode and decipher standard use the intermediate pattern with general CIF to be allowed at different television system. H.221 multichannel answer with / solution answer serves channel frame structure with definition 64k-1920k seeing and hearing the join mechanism of different media, the synchronism on space and time returns model. H.261 video encode and decipher standard use the intermediate pattern with general CIF to be allowed at different television system.
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