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About HD-SDI Camera

About HD-SDI Camera

What is the HD-SDI interface? The following is a brief introduction to the development limitations of the HD-SDI interface. The main way to get to know the HD-SDI interface and talk about networking to ensure smooth network transmission is to compress the data. The HDSDI technology is undoubtedly bound by its huge transmission data to the information island. At the same time, the low level of remote monitoring and network integration also affects the expansion and application of HDSDI intelligent functions.

1, the front end lightning protection is not easy to solve

SDI comes from the field of broadcasting and television. For a long time, the uniqueness of SDI products in transmission and storage has brought significant confusion to system lightning protection. One of the reasons is that the transmission characteristics of SDI products make its transmission frequency requirements high. SDI is known for its excellent performance without high-definition image acquisition, no delay transmission and no distortion, which puts higher requirements on transmission cables and lightning arresters. . The SDI transmission rate can reach up to 1.485G, even up to 3G, while the traditional analog video signal is up to 10M. The common analog video lightning protection device is difficult to meet the hard requirement of SDI, and there is no need to mention lightning protection performance. Deeply troubled by many lightning protection manufacturers. Second, SDI products require a wider range of transmission channels. SDI not only transmits uncompressed video signals, but also transmits audio, control and power signals through carrier technology. Its design principle completely distinguishes the original analog video signal lightning protection device and IP network lightning protection device. The key to lightning protection of SDI products lies in the rational design of internal lightning protection. In fact, many security companies' SDI products are in internal lightning protection (such as PCB lightning protection, conductive lightning protection, reasonable lightning protection circuit design and reasonable layout of external interfaces). There is no good solution.

2, the level of the cable

HD-SDI high-definition video signals can be transmitted on dedicated SDI cables to ensure the best results of video signals, but special SDI cables include connectors that are expensive. In actual projects, if all dedicated SDI lines are used. The cable will increase the construction cost, and after actual testing, the high-level coaxial cable and BNC head can also ensure the video effect. Moreover, as long as the use of SDI is gradually widened, the price of related auxiliary materials will definitely drop significantly.

3, the solution to the storage

As mentioned above, the amount of high-definition uncompressed video signal is very large, and the cost of directly storing it with such data is quite large, so from practical considerations, video

The storage still needs to be compressed. Specifically, it can be solved by SDI-DVR or SDI encoder with NVR. Can be flexibly selected according to the actual project. Even so, the advantages of the HD-SDI system over the HD-IP system are obvious: the HD-SDI system wins in real-time control while maintaining the same quality of storage capacity. At the same time, the HD-SDI system is completely uncontrolled. Delay, so you can do what you see and you don't lose important videos.