Tags: HD-SDI Matrix IP Monitoring
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It is said that the practice is not practiced, especially for security products. However, theory is the basis of practice. No, the video matrix in the recent hot topic HD-SDI products has come together. After reading the following five questions, you may know how to use the HD-SDI matrix.
One of the top five problems: the concept and difference of HD-SDI matrix system
What is the HD-SDI matrix system? What is the difference between it and the traditional analog matrix? What is the difference in structure or appearance? What are the differences between the system interface or video signal conversion?
The HD-SDI matrix is ​​a digital image matrix switcher, which is a BNC interface. It is a high-performance intelligent matrix switch device for switching the display of SDI digital video signals. It is mainly used to switch the image input signals to images. Any channel in the output channel has been widely used in broadcast television engineering, multimedia conference halls, large-screen display engineering, television teaching, command and control centers and other markets. This product is generally equipped with power-off protection, and has RS-232/422 or RS-485 data control interface, which can control the main system, convenient to set up the computer, remote control keyboard or cooperate with various remote human-machine control devices. .
What is the difference between SDI and the traditional analog signal matrix?
First of all, we understand that the principle of the matrix circuit is different due to the difference of the signal source. The traditional matrix is ​​a Crosspoint Circuit, while the SDI is currently 1:1, 1:4 or 1:8. SDI image input, to distribute the amplified card, plus 4-channel or 8-channel SDI signal synchronization processing, the input and output signals are synchronously distributed, and the signal is converted to NTSC by the analog/digital converter at the end. The PAL TV video signal is output to the screen (Monitor).
From the appearance and equipment structure, the traditional matrix and SDI matrix are almost no big difference, but if we look at the system architecture, we can find that the traditional matrix has 6×4, 32×8, 32×16, 64×16, 96. ×16, 128×32, 256×96, and 4,096×256 are relatively irregular matrix changes. The SDI matrix is ​​currently limited by the limitations of the signal components and the distribution amplification rules. The scale is about 1×4, 4×4, 8×8, 16×16 and 32×32, and becomes 64×32, 64× after the card stack. 64, 96 × 32 and 96 × 64, and then to a maximum of 128 × 32 and other regular structures. The prior art conditions are probably 128×128, which is the practical maximum capacity. To break through this limitation, it may have to wait until the material equipment and technology break through.
Two of the top five questions: What are the advantages of the HD-SDI matrix?
What advantages does the HD-SDI matrix have over traditional matrix in PTZ and system control? What are the advantages of HD-SDI matrix in the transmission of sound, power and control signals? And does the control management software have different operation management from the traditional matrix?
In general, regardless of the traditional matrix or SDI high-resolution matrix, the transmission medium of Belden1694A coaxial cable is basically used as the image signal, while in the transmission and control of camera PTZ and sound, RS-232/422 is mostly used. Or RS-485 duplex or half duplex (Full/HalfDuplex) mode to transmit control signals to the camera. Under the condition that the SDI camera reaches 3G-SDI, some manufacturers also put the sound, power and control signals in the blank part of the image synchronization signal in the way of leading the image signal for half a week, thus achieving the requirement of a single coaxial transmission matrix. However, in terms of current product technical conditions, signal transmission distance is still one of the obstacles that the SDI matrix is ​​lingering.
The SDI matrix system generally provides RS-485 protocol, which involves the control protocol (ControlProtocol) that must be paid attention to in engineering in the past. Through the same conditions, PTZ control of SDI high speed ball or all-in-one can be realized. . The keyboard can control the matrix via RS-232/422 or RS-485 network ports. The SDI matrix product also has the function of control setting software, which provides user-friendly operation management in system setting and operation. In the long-distance SDI high-resolution matrix and high-resolution camera, the system can now be constructed as a non-compressed high-resolution digital real-time monitoring system through the circuit composed of SDI optical transceivers.
The three major problems: HD-SDI matrix core operating system
Is the HD-SDI matrix processor the same as the traditional matrix? What is the image performance? What is the processor system used in the HD-SDI matrix? What is the core operating system? Is its operating performance stable?
Most of the SDI high-resolution digital matrix control systems use microprocessor technology, such as the ARM series of processors, and will use a more stable and reliable Linux core operating system to stabilize the system's operating efficiency. The system can support up to 128 or 256 inputs on SDI routing, and 128 input and output SDI interfaces containing audio and video signals.
As for the image performance, due to the different format conditions of the SDI camera itself, the SDI matrix must be compatible with receiving SDI video signals of 720p or 1080i/1080p@30fps or 60fps, and for the standard definition or 960H high line number. The analog image signal input to the output must also be able to switch arbitrarily. This is the specific image performance of the SDI matrix, which was not possible in the past.
The fifth problem: HD-SDI matrix and IP surveillance compatibility
After adopting the HD-SDI matrix, is it difficult to integrate with the IP network monitoring system? What are the integrated methods, architectures and devices used, and which referral devices are needed for the conversion of different signals to achieve the purpose of integration?
In terms of integration with the IP surveillance system, the SDI matrix generally configures the network port or can connect the image conversion server (SDIDVS) to the SDI to TCP/IP or NTSC or PALVideo. From DVS to TCP/IP signal, it is still possible to make a perfect system integration of SDI matrix and network monitoring system. At the same time, through the monitoring center networking mode, the matrix is ​​uniformly configured and managed by the center. Multiple sets of matrices can download configuration information from the central matrix via the network, and the SDI matrix can be built and managed at one time to realize distributed deployment on the SDI high-resolution matrix network. With the requirements of centralized management.
Five of the five problems: redundancy of HD-SDI matrix
What are the stability of the HD-SDI matrix? Which redundancy design? Is there a new application method? When the functions are different, is the matrix architecture and design different? Is the matrix superposition method different? What is the design and structure of different? Redundant systems?
As an image monitoring platform, SDI matrix has new application methods and operation methods in control, alarm, character, display, etc. Therefore, compatibility content and functions such as control and alarm system interface are slightly different from traditional matrix in the past. Differences, for example, in the OSD character superimposition and subversion of the traditional analog matrix character superposition, so that the output display can switch the signal, conversion, splicing control, picture fusion and other functions, the collection becomes a specific switching mode, so in complete Under the different circuit architecture thinking, SDI matrix structure stability and quality reliability will become a more important topic.
From different SDI matrix structures, such as modular, plug-in, blade, etc., are the sources of frequent problems in the development of SDI matrix. For example, whether the system can be hot-inserted on the modular plug-in type is related to the stability of the system and the reliability.
Of course, modularity is one of the best ways, including control, power systems, etc. These structures greatly facilitate the engineering of fault resolution and system maintenance. At the same time, due to the modular design, the matrix expansion becomes easy to stack. On the one hand, it is convenient for manufacturers to produce, and at the same time, it can improve the production speed of the product, reduce the product failure rate, and improve stability and reliability. In terms of redundant backup capability, most SDI matrix control and power systems, except for modular, slot or board structures, are mostly manufactured with dual control, dual power supply, and redundant heat. Backup (automatic backup) to avoid the possibility that the manual backup system may cause system failure.
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