Position:3, realize signal easily put lay aside and retrieve, can use nonlinear efficient and quick search gives search way all sorts of place require type file, avoided to use imitate signal to search a method close to mandatory order;
4, digital technology and computer cooperate, can realize the automata of CCTV number facilities and operation. This is having real sense to automation of freeway CCTV system;
5, use technology of time multichannel number, can realize channel multitask answer is used;
6, use a number to code the technology makes video transmits channel bandwidth to decrease apparently than imitate video, occupy the 1/4 left and right sides of bandwidth for FM video place normally, and as current as the freeway extensive mood uses for the most part in construction fiber-optic transmit all the way or place of a few video occupies bandwidth to cannot be compared more;
7, use digital code method, of facilitating video confidential;
8, digital video signal is had but expansibility, can divide polarity and sex of each other operation, facilitate transmit in system of of all kinds communication. All sorts of functions that want implementation to highway institute will tell, this are very important. Because follow a comprehensive advent that digitlizes a times, of imitate system transform those who mean equipment is all fall into disuse update, can create enormous waste; And digitlization system can come true be based on digital platform to go up expand and transform. It is in order to correspond exemple, at present the freeway popularizes use capacity to be 155M/STM-1 or 622M/STM-4 communication platform relatively, as the technology development and demand day are added, the technology such as WDM/DWDM can be used completely henceforth to undertake expand and upgrading to its on digitlization platform.
When look from above, digital system not only relatively imitate system performance advantageous, function is powerful, and no matter be to be in current condition or the complete digitlization times henceforth, can make investor holds active position in competition.
From another angle namely specific implementation is large-scale the digitlization of network video transmits a respect to tell, as the swift and violent development of communication technology and computer technology, it is ATM, SDH, Ethernet no matter the MPEG I of such as of or of transmission trade technology, MPEG II, H.261/H.320, Wavelet maturity that compresses a technology and practical change, realizing video network digitlization to transmit already was not a problem completely. Come in especially the development of the occurrence that exchanges net of aether of type high speed and IP technology, make video shedding cannot be interrupted this kind, cannot the missing, network digitlization with more sensitive to synchronism special data transmits application to become reality completely.
Current the digital video on the market transmits a product to look, from transmission exchange technology and its agreement want cent to be the following sort mode roughly.
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