Monitor front-end: camera technology is mature 3GPP protocol concern – monitorin
In general, the monitoring system consists of signal acquisition front-end equipment (such as cameras, etc.), remote-action devices, digital
DVR Network video server and video and audio compression DVR component.
Advanced Video Technology Co., Beijing Company Software Engineer Yan Wei said that the current 3G technology is relatively mature surveillance camera products, can reach D1 or CIF resolution ,20-25 frames per second transfer rate, and for the three operators, the mainstream manufacturers have produced a corresponding supporting monitoring products. At the same time for the domestic 3G network coverage is not high situation, many manufacturers also produced with the 3G network and GP
RS Automatic switching products. Relative to the monitoring equipment, video transmission has become the bottleneck of the development control front-end to form a clearer picture taken, the higher the contradiction between the back-end delay. "This is mainly in the practical application, 3G network is relatively small upstream bandwidth, upload a larger sub-flow, resulting in a real-time and fluency are delayed, thus affecting the viewing experience." Tianjin Yaan Technology
Electronic Limited digital product manager Liang Ge explained. Most of the market monitoring equipment used in 3G is H.264 protocol. Agreement to H.264 video encoding, each VGA (640 × 480) of the program stream takes about 300Kbps of bandwidth, if the mobile phone screen resolution of QVGA (320 × 240) calculated stream programs, 300 / 4 = 75Kbps constant bandwidth, the existing network bandwidth, and can basically meet the next.
However, 3G mobile phone applications will certainly involve monitoring, and H.264 compression can not support mobile streaming media servers direct forward play, need to increase the conversion server, with the increase of subscribers, will form a huge transformation server cluster, so that in the system architecture, users, adversely affect the costs of both. "Many of the current market
Network Camera Products, are needed to achieve a conversion mobile phone play. In this case, 3G front-end monitoring equipment must be compatible with a richer wireless interface protocol, to achieve more extensive fields. "Digital Technology Co., Ltd. Tianjin World Albert digital product manager Qu Ming Kwan said.
Currently, 3G mobile terminals to support surveillance plays a necessary requirement, and therefore, as a third-generation wireless interface specification of the 3GPP protocol as in the 3G mobile intelligent terminal market with strong competitiveness and concern.
It is understood that the embedded digital front-end 3GPP network video compression technology, real-time control, network
Communicate Transmission technology and many other technologies, analog cameras to capture the video signal through digital compression, the use of RTP, DHCP, RTCP, TCP / IP, 3GPP and other agreements, through the LAN, INTERNET, mobile network transmission. Users can use
Standard
The IE web browser, media player or a standard application software to access remote video server, real-time image viewing, and the control of the camera lens and head, to achieve a full range of real-time monitoring. If the 3G network of smart phone users, as long as the agreement to install support for 3GPP media player, users can watch streaming video on the phone image.
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