HD cameras go online

HD cameras go online As a high-definition surveillance front-end device, high-definition cameras are bound to become networked.

Network Camera Wireless Transmission Technology HD network cameras provide people with a clear visual experience while also placing higher requirements on network bandwidth. Taking 720P real-time video as an example, an HD network camera adopting the standard H.264 MainProfile compression algorithm requires at least 2 Mbps to obtain “HD” visual effects, while 1080P full-real-time video requires 4Mbsp or more. The upstream bandwidth of ordinary ADSL has long been unable to meet the needs of high-definition video. With the maturation and application of wireless and wired broadband technologies such as 3G, Wi-Fi, and private networks, the long-distance transmission of large-volume data is more convenient, which also eliminates the transmission barriers of high-definition network cameras in a wide range of applications.

At present, self-built optical fiber networks or local area networks are usually used to implement 1000M bandwidth networks in projects such as safe cities and financial network monitoring. This kind of Gigabit bandwidth resources, installed in the front-end 100 Road 1080P full-real-time high-definition network cameras (even if calculated by each channel to take up resources 4Mbps), occupying less than 50% of the total bandwidth resources; if you use 720P transmission, the bandwidth can also be reduced by half. In this way, it can fully support the practical application of high-definition network cameras.

In terms of wireless transmission, 3G networks have accelerated the speed of mobile Internet access, making applications such as videophones and mobile games in full swing. However, in the security video surveillance industry, there is no substantive application. The reasons for this are the relative lag in 3G network construction and the fact that 3G tariffs are still too high. In the face of high-definition video surveillance requirements for bandwidth, 3G is still unreliable. In order to truly achieve high-definition wireless video surveillance, we also need to wait until 4G promotion. At present, the emergence of TD-LTE has opened the door for high-definition video surveillance in the 4G era.

TD-LTE is the direction and foundation for the evolution of TD-SCDMA to IMT-Advanced (4G standard). It inherits and develops TD-SCDMA technology with independent intellectual property rights in China and has received extensive international support. According to the definition of TR25.913 of 3GPP, the peak rate of LTE is required to be high, with an uplink of 50 Mbps and a downlink of 100 Mbps. From the aspect of spectrum efficiency, the spectrum efficiency of both uplink and downlink is 3-4 times that of China’s current network. The technological development of LTE has attracted the participation of different system specifications, including UMTS (ie, 3GSM), and the participation of the CDMA2000 camp, making LTE gradually a possibility for future wireless network 4G.

At the Shanghai World Expo, the TD-LTE demonstration network constructed by China Mobile covered 5.28 square kilometers of the Expo Park. A total of 17 TD-LTE outdoor stations were built, and the indoor coverage of 9 venues was achieved, including 7 venues in Pudong, Puxi. Venues. The demonstration services such as mobile high-definition conferencing, mobile high-definition video surveillance, mobile high-definition video on-demand transmission, and portable video transmission based on the TD-LTE demonstration network are all open to the public and have achieved good results.

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