Light says no practice, especially for security products. However, the theory is the basis of practice, this is not, about the recent hot topics of HD-SDI products in the video matrix to join in the fun, after reading the following five issues, perhaps let you know how to use the HD-SDI matrix.
One of the five big questions: Concepts and differences of HD-SDI matrix systems What is an 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 system interface or video signal conversion?
The HD-SDI matrix is ​​a digital image matrix switcher, which is a BNC interface and is a display switch for SDI digital image signals. The high-performance intelligent matrix switcher is mainly used to switch the video input signals of each channel to an image. Any one of the output channels has long been widely used in broadcast television projects, multimedia conference rooms, large screen display engineering, television teaching, and command and control centers. This kind of product generally has a power-off protection, and has RS-232/422 or RS-485 data control interface, can control the main system, easy to set the computer, remote control keyboard or use with a variety of remote human-machine control equipment .
What is the difference between SDI and traditional analog signal matrices?
First of all, we understand that due to the different signal sources, the matrix circuit is also different. The traditional matrix is ​​a crosspoint circuit (Crosspoint Circuit), and SDI is currently 1:1, 1:4, or 1:8 SDI. Image input, distribution and card insertion methods, plus 4 or 8 SDI signal synchronization processing methods, the input and output signals will be allocated synchronously, and the end will be converted to NTSC or PAL by an analog/digital converter. The TV video signal is output to the monitor.
From the aspect of appearance and equipment structure, traditional matrix and SDI matrix are not much different, 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, 4,096×256 and other irregular matrix changes. The SDI matrix is ​​currently limited by the limitations of signal components and distribution amplification rules. Its size is approximately 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 the maximum 128 × 32 and other regular structures. The existing technical conditions probably take 128×128 as the maximum capacity that can be practically used. Breaking this limit may only be realized when the material equipment and technology break through again.
The fifth problem: What are the advantages of the HD-SDI matrix?
What are the advantages of HD-SDI matrices over PTZ and system control over traditional matrices? What are the advantages of HD-SDI matrix in the transmission of sound, power, and control signals? Is control management software different from traditional matrix operation management?
In general, regardless of the traditional matrix or SDI high-resolution matrix, basically Belden1694A coaxial cable is used as the transmission medium of the video signal. In the transmission and control of the camera PTZ and sound, there are mostly RS-232/422. Or RS-485 duplex or half duplex (Full/Half Duplex) method to transmit the control signal to the camera. Under the condition that the SDI camera reaches 3G-SDI, there are also manufacturers who place the sound, power, and control signals on the blank part of the image synchronization signal in a half-weekly leading image signal, thus achieving a single coaxial transmission matrix requirement. However, with the current product technology conditions, the signal transmission distance is still one of the lingering obstacles to the SDI matrix.
The SDI matrix system generally provides the RS-485 protocol. This will involve the control protocol that must be noted in the past in the engineering. Through the same conditions, the PTZ control of the SDI high-speed ball or all-in-one machine can be realized. . The keyboard can control the matrix through RS-232/422 or RS-485 network ports. The SDI matrix product also has the function of control setting software. In terms of system setting and operation, it can provide users with convenient operation management. Between long-distance SDI high-resolution matrices and high-resolution cameras, the system can now be constructed as a non-compressed, high-resolution digital real-time monitoring system, HD-SDI matrix core operating system, using the loop formed by SDI optical transceivers. 3. Is the HD-SDI Matrix Core Operating System HD-SDI matrix processor the same as the traditional matrix? How is the image performance generally? What is the processor system used in the HD-SDI matrix? What is the core operating system? Is its operational efficiency stable?
Most 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 operating efficiency of the system. The system can support up to 128 or 256 inputs on SDI routing, and 128 outputs include input and output SDI interfaces with video signals.
As for image performance, due to the different format conditions of the SDI camera itself, the SDI matrix must be compatible with SDI video signals that can receive 720p or 1080i/1080p @ 30fps or 60fps. At the same time, the SDI matrix must be compatible with the SD or 960H lines. The input of the analog video signal to the output can also be arbitrarily switched. This is the specific image performance that the SDI matrix has, which is also unachievable by the traditional matrix in the past.
Five of the four questions: Compatibility of HD-SDI matrix and IP monitoring After adopting HD-SDI matrix, is it difficult to integrate with IP network monitoring system? What are the integration methods, architectures, and equipment used? What kind of referral equipment is required for the conversion of different signals to achieve the purpose of integration?
In terms of integration with the IP surveillance system, under the monitoring system networking requirements, SDI matrix will generally configure the network port or can be connected to the image conversion server (SDIDVS), the signal directly to SDI to TCP / IP, or via NTSC or PALVideo again From DVS to TCP/IP signal, it is still a perfect system integration for SDI matrix and network monitoring system. At the same time, through the monitoring center networking mode, the center performs unified configuration and management of the matrix. Multiple groups of matrixes can download configuration information from the center matrix via the network. The SDI matrix can be built and managed at one time to implement distributed deployment of SDI high-resolution matrix networking. With centralized management requirements.
Five of the five major issues: Redundancy of HD-SDI matrices How stable are the HD-SDI matrices? What are the redundant designs? Is there a new application? When the functionality is different, is the architecture and design of the matrix different? Is there a difference in the character superposition method of the matrix? What is the design and structure of the redundant system?
As an image monitoring platform, SDI matrix has new application methods and operation methods in control, alarm, character, display, etc. Therefore, compatibility contents and functions such as control and alarm system interface are slightly different from traditional matrix. Differences, such as: Overlapping of OSD characters and subverting past traditional analog matrix character superposition, enables the output display to switch signal switching, conversion, splicing control, and image fusion functions into a specific switching method, and thus completely Under different circuit architecture thinking, the stability and quality reliability of the SDI matrix structure will become a more important issue.
From different SDI matrix structures, such as modular, plug-in, blade, etc., are the sources of problems that frequently arise in the development process of SDI matrix. For example, whether the system can be hot plugged in, for example, a modular plug-in card, is related to the stability and reliability of the system.
Of course, modularization is the best method, including control, power system, etc. These structures greatly facilitate the troubleshooting and system maintenance engineering. At the same time, due to the modular design, the matrix expansion has become easy to stack, on the one hand to facilitate the manufacturer's production, while also increasing the production speed of the product, reducing product failure rate, and improving stability and reliability. In terms of redundant backup capabilities, most of the SDI matrix control and power supply systems, in addition to requiring modular, slot or board structure, are currently manufactured with dual control, dual power supplies, and redundant heat. Backup (automatic backup) to avoid the possibility of system failure due to manual backup system. Original address: http://security.zol.com.cn/307/3078808_all.html#p3078808
One of the five big questions: Concepts and differences of HD-SDI matrix systems What is an 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 system interface or video signal conversion?
The HD-SDI matrix is ​​a digital image matrix switcher, which is a BNC interface and is a display switch for SDI digital image signals. The high-performance intelligent matrix switcher is mainly used to switch the video input signals of each channel to an image. Any one of the output channels has long been widely used in broadcast television projects, multimedia conference rooms, large screen display engineering, television teaching, and command and control centers. This kind of product generally has a power-off protection, and has RS-232/422 or RS-485 data control interface, can control the main system, easy to set the computer, remote control keyboard or use with a variety of remote human-machine control equipment .
What is the difference between SDI and traditional analog signal matrices?
First of all, we understand that due to the different signal sources, the matrix circuit is also different. The traditional matrix is ​​a crosspoint circuit (Crosspoint Circuit), and SDI is currently 1:1, 1:4, or 1:8 SDI. Image input, distribution and card insertion methods, plus 4 or 8 SDI signal synchronization processing methods, the input and output signals will be allocated synchronously, and the end will be converted to NTSC or PAL by an analog/digital converter. The TV video signal is output to the monitor.
From the aspect of appearance and equipment structure, traditional matrix and SDI matrix are not much different, 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, 4,096×256 and other irregular matrix changes. The SDI matrix is ​​currently limited by the limitations of signal components and distribution amplification rules. Its size is approximately 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 the maximum 128 × 32 and other regular structures. The existing technical conditions probably take 128×128 as the maximum capacity that can be practically used. Breaking this limit may only be realized when the material equipment and technology break through again.
The fifth problem: What are the advantages of the HD-SDI matrix?
What are the advantages of HD-SDI matrices over PTZ and system control over traditional matrices? What are the advantages of HD-SDI matrix in the transmission of sound, power, and control signals? Is control management software different from traditional matrix operation management?
In general, regardless of the traditional matrix or SDI high-resolution matrix, basically Belden1694A coaxial cable is used as the transmission medium of the video signal. In the transmission and control of the camera PTZ and sound, there are mostly RS-232/422. Or RS-485 duplex or half duplex (Full/Half Duplex) method to transmit the control signal to the camera. Under the condition that the SDI camera reaches 3G-SDI, there are also manufacturers who place the sound, power, and control signals on the blank part of the image synchronization signal in a half-weekly leading image signal, thus achieving a single coaxial transmission matrix requirement. However, with the current product technology conditions, the signal transmission distance is still one of the lingering obstacles to the SDI matrix.
The SDI matrix system generally provides the RS-485 protocol. This will involve the control protocol that must be noted in the past in the engineering. Through the same conditions, the PTZ control of the SDI high-speed ball or all-in-one machine can be realized. . The keyboard can control the matrix through RS-232/422 or RS-485 network ports. The SDI matrix product also has the function of control setting software. In terms of system setting and operation, it can provide users with convenient operation management. Between long-distance SDI high-resolution matrices and high-resolution cameras, the system can now be constructed as a non-compressed, high-resolution digital real-time monitoring system, HD-SDI matrix core operating system, using the loop formed by SDI optical transceivers. 3. Is the HD-SDI Matrix Core Operating System HD-SDI matrix processor the same as the traditional matrix? How is the image performance generally? What is the processor system used in the HD-SDI matrix? What is the core operating system? Is its operational efficiency stable?
Most 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 operating efficiency of the system. The system can support up to 128 or 256 inputs on SDI routing, and 128 outputs include input and output SDI interfaces with video signals.
As for image performance, due to the different format conditions of the SDI camera itself, the SDI matrix must be compatible with SDI video signals that can receive 720p or 1080i/1080p @ 30fps or 60fps. At the same time, the SDI matrix must be compatible with the SD or 960H lines. The input of the analog video signal to the output can also be arbitrarily switched. This is the specific image performance that the SDI matrix has, which is also unachievable by the traditional matrix in the past.
Five of the four questions: Compatibility of HD-SDI matrix and IP monitoring After adopting HD-SDI matrix, is it difficult to integrate with IP network monitoring system? What are the integration methods, architectures, and equipment used? What kind of referral equipment is required for the conversion of different signals to achieve the purpose of integration?
In terms of integration with the IP surveillance system, under the monitoring system networking requirements, SDI matrix will generally configure the network port or can be connected to the image conversion server (SDIDVS), the signal directly to SDI to TCP / IP, or via NTSC or PALVideo again From DVS to TCP/IP signal, it is still a perfect system integration for SDI matrix and network monitoring system. At the same time, through the monitoring center networking mode, the center performs unified configuration and management of the matrix. Multiple groups of matrixes can download configuration information from the center matrix via the network. The SDI matrix can be built and managed at one time to implement distributed deployment of SDI high-resolution matrix networking. With centralized management requirements.
Five of the five major issues: Redundancy of HD-SDI matrices How stable are the HD-SDI matrices? What are the redundant designs? Is there a new application? When the functionality is different, is the architecture and design of the matrix different? Is there a difference in the character superposition method of the matrix? What is the design and structure of the redundant system?
As an image monitoring platform, SDI matrix has new application methods and operation methods in control, alarm, character, display, etc. Therefore, compatibility contents and functions such as control and alarm system interface are slightly different from traditional matrix. Differences, such as: Overlapping of OSD characters and subverting past traditional analog matrix character superposition, enables the output display to switch signal switching, conversion, splicing control, and image fusion functions into a specific switching method, and thus completely Under different circuit architecture thinking, the stability and quality reliability of the SDI matrix structure will become a more important issue.
From different SDI matrix structures, such as modular, plug-in, blade, etc., are the sources of problems that frequently arise in the development process of SDI matrix. For example, whether the system can be hot plugged in, for example, a modular plug-in card, is related to the stability and reliability of the system.
Of course, modularization is the best method, including control, power system, etc. These structures greatly facilitate the troubleshooting and system maintenance engineering. At the same time, due to the modular design, the matrix expansion has become easy to stack, on the one hand to facilitate the manufacturer's production, while also increasing the production speed of the product, reducing product failure rate, and improving stability and reliability. In terms of redundant backup capabilities, most of the SDI matrix control and power supply systems, in addition to requiring modular, slot or board structure, are currently manufactured with dual control, dual power supplies, and redundant heat. Backup (automatic backup) to avoid the possibility of system failure due to manual backup system. Original address: http://security.zol.com.cn/307/3078808_all.html#p3078808
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