Application of HD-SDI in Security Video Surveillance System
2024-07-11 16:01:18
With the end of 2011 Shenzhen CPSE Anbo, the security market camp is more clearly divided into analog SD, analog HD, network standard definition, network HD and digital HD, and HD-SDI products derived from digital HD have been released after the winter. The year is bound to become the new darling of the entire security market.
SDI Definitions and Product Advantages SDI Definition SDI is an acronym for serial digital interface. The serial interface is an interface for sequentially transmitting bits and corresponding data of data words through a single channel. Many people may not understand what exactly SDI is and throw away specialized parameter data. In simple terms, SDI technology is a continuation of radio and television technology, and SDI monitoring technology is also a derivative of radio and television technology. According to the current SDI technology, SDI is divided into SD-SDI, HD-SDI, and 3G-SDI. SD-SDI is defined as standard-definition digital signal; HD-SDI is defined as high-definition digital signal; 3G-SDI is also defined as high-definition digital signal. The SD-SDI transmission rate is 270 Mbps; the HD-SDI transmission rate is 1.485 Gbps; the 3G-SDI transmission rate is 2.97 Gbps. The most popular application in our surveillance area is HD-SDI. At present, all digital SDI digital HD products used in the world are HD-SDI high-definition digital signals.
HD-SDI's Product Advantage In the field of security, the application of HD products is in full swing. Digital HD with ONVIF and PSIA as the alliance and HD-cctv as the alliance are gradually occupying the market of high-definition products in the future. HD-SDI products are embarking on the starting line of the security market as a young athlete. High-tech products in the Shenzhen CPSE Anniversary Fair in 2011 also indicates that the security market's high-definition outbreak locked in 2012, and HD-SDI products as a new darling of the security industry will occupy a certain share of the market. Through years of accumulation in the security market, from the very beginning of analog surveillance to the subsequent network monitoring, a network HD monitor was derived on the basis of network monitoring, and HD-SDI digital high-definition surveillance is the future development of the entire security market. The digital signals processed by HD-SDI products are transmitted through the coaxial cable. The video interface of the products is the BNC port. The transmission cable used is the national standard "75-5" video cable that we often see in the project, because of the habit of most users. Many contractors, including Party A, are accustomed to calling HD-SDI digital high-definition "analog HD". In fact, this name is wrong. Based on the characteristics of HD-SDI products, the product advantages are summarized as follows:
Advantage 1 As the equipment is connected with BNC interface, that is to say, in the process of converting the existing traditional analog frame system to a high-definition monitoring system, there is no need to re-wiring, and only the front-end and back-end parts need to be replaced, which will save huge projects The time cost and labor cost.
Advantage two products are easy to use. Because the system framework adopted for HD-SDI product construction and the analog monitoring system framework are the same, the system wiring can be realized with a 75-5 coaxial cable, and construction workers and system operators do not need training and it is easier to get started.
Advantages of three non-compression. HD-SDI is unlike IP surveillance in which the video signal is transmitted through the network after being compressed and packed. The uncompressed digital signal is transmitted on the coaxial cable at high speed, and the original image is not distorted.
Advantage four HD real-time. HD-SDI monitoring is not affected by the transmission network and there will be no image delay caused by IP network monitoring. In real-time monitoring and high-definition requirements.
Advantage 5 Equipment utilization rate is high. The resolution of the HD-SDI device video output image is 1920×1080, and the camera dot density per unit area is greatly reduced. Provide more details on the monitoring site, such as seeing the face and seeing the license plate.
The product features of the HD-SDI system architecture design of the two HD-SDI product systems are overall compatible. To achieve true HD monitoring, video source acquisition, video signal processing, video signal transmission, and video display browsing must be implemented. The playback of video files and other links fully support high definition. For users, HD only makes sense when it includes front-end, transmission, browsing, display, platform, and storage. According to the characteristics of project site requirements, the system topology of HD-SDI products is generally divided into small and medium-sized ones.
The small HD-SDI system meets the characteristics of small space and small number of points, enabling real-time HD surveillance preview and storage. For small-scale monitoring systems, analog monitoring systems can be directly upgraded to HD-SDI high-definition monitoring systems. The original wiring of the system is not more than 100 meters between each device and the wire meets the "75-5" standard, and product replacement can be achieved.
For large HD-SDI systems, HD-SDI high-definition encoder compresses the front-end HD-SDI video signal to H due to the large number of front-end monitoring points and large amount of stored data. 264 network signals are stored in the IPSAN. There may be doubts from users why HD-SDI was eventually compressed via the Internet. Such questions can be answered through the topology diagram: After the HD-SDI front-end all-way high-definition real-time video enters the video distributor, all the way to the HD matrix can be previewed in real time, and all the video is distributed to the HD encoder alone for storage. High-definition live preview also guarantees HD storage.
According to the two HD solutions mentioned above, users can choose according to the application in the actual project. It is not difficult to see that the implementation of the entire project and the construction of the project are not too difficult for the project owner. The installation and use of the equipment is exactly the same as the analog monitoring system. The front-end dome can be controlled by using the keyboard to connect the optical transceiver through reverse data. The system's versatile choice of wiring and architecture is easy to navigate. However, for the HD-SDI digital HD system, there are also some hard indicators:
The biggest difference between the connection mode analog front end and the HD-SDI front end is that once the analog front end is connected badly or the interface is imaginary, the video signal will have horizontal stripes or jitter but the video can still be viewed, and the HD-SDI front end will be connected once. Bad or bad interface video will disappear. The frequency of the analog video is wavy, and the HD-SDI video frequency is broken. Some engineering practices are using to cut the BNC head and BNC header of the video cable directly. This method of operation has a great effect on the HD-SDI video output. Attenuation.
Transmission system wiring generally uses a standard 75-5 video cable. At present, the maximum transmission distance of HD-SDI is 100 meters. After the transmission distance is greater than 100 meters, the video disappears due to video attenuation. In long-distance transmission, the optical fiber can be used for transmission. This not only ensures the video quality but also ensures the stability of the video transmission.
When the output HD-SDI video is converted to HDMI signal through the converter, the video signal will be interfered with by different levels due to the various advantages of HDMI cables. The maximum distance tested at present is 20 meters, but the video signal will pass after 15 meters. Different levels of attenuation.
Display mode In the HD-SDI HD solution, there will be different brands of video signal amplifiers to extend the signal transmission distance, but due to the different brands of video sources at the front end, there will be compatibility issues and the video signals will not be output. Because broadcast-level HD-SDI monitors are expensive, they will not be used in actual monitoring projects, and HDMI-enabled HDTVs will be the first choice for display devices. Although different brands of HDTVs support HDMI signal input, they are defined. Different video input parameters lead to compatibility issues with different brands of HD-SDI video sources and the message "This format is not supported."
The problems mentioned in the above 4 points will form a constraint in the implementation of the HD-SDI project. However, the pre-project investigation and product testing can also be used to smoothly promote high-definition products.
SDI Definitions and Product Advantages SDI Definition SDI is an acronym for serial digital interface. The serial interface is an interface for sequentially transmitting bits and corresponding data of data words through a single channel. Many people may not understand what exactly SDI is and throw away specialized parameter data. In simple terms, SDI technology is a continuation of radio and television technology, and SDI monitoring technology is also a derivative of radio and television technology. According to the current SDI technology, SDI is divided into SD-SDI, HD-SDI, and 3G-SDI. SD-SDI is defined as standard-definition digital signal; HD-SDI is defined as high-definition digital signal; 3G-SDI is also defined as high-definition digital signal. The SD-SDI transmission rate is 270 Mbps; the HD-SDI transmission rate is 1.485 Gbps; the 3G-SDI transmission rate is 2.97 Gbps. The most popular application in our surveillance area is HD-SDI. At present, all digital SDI digital HD products used in the world are HD-SDI high-definition digital signals.
HD-SDI's Product Advantage In the field of security, the application of HD products is in full swing. Digital HD with ONVIF and PSIA as the alliance and HD-cctv as the alliance are gradually occupying the market of high-definition products in the future. HD-SDI products are embarking on the starting line of the security market as a young athlete. High-tech products in the Shenzhen CPSE Anniversary Fair in 2011 also indicates that the security market's high-definition outbreak locked in 2012, and HD-SDI products as a new darling of the security industry will occupy a certain share of the market. Through years of accumulation in the security market, from the very beginning of analog surveillance to the subsequent network monitoring, a network HD monitor was derived on the basis of network monitoring, and HD-SDI digital high-definition surveillance is the future development of the entire security market. The digital signals processed by HD-SDI products are transmitted through the coaxial cable. The video interface of the products is the BNC port. The transmission cable used is the national standard "75-5" video cable that we often see in the project, because of the habit of most users. Many contractors, including Party A, are accustomed to calling HD-SDI digital high-definition "analog HD". In fact, this name is wrong. Based on the characteristics of HD-SDI products, the product advantages are summarized as follows:
Advantage 1 As the equipment is connected with BNC interface, that is to say, in the process of converting the existing traditional analog frame system to a high-definition monitoring system, there is no need to re-wiring, and only the front-end and back-end parts need to be replaced, which will save huge projects The time cost and labor cost.
Advantage two products are easy to use. Because the system framework adopted for HD-SDI product construction and the analog monitoring system framework are the same, the system wiring can be realized with a 75-5 coaxial cable, and construction workers and system operators do not need training and it is easier to get started.
Advantages of three non-compression. HD-SDI is unlike IP surveillance in which the video signal is transmitted through the network after being compressed and packed. The uncompressed digital signal is transmitted on the coaxial cable at high speed, and the original image is not distorted.
Advantage four HD real-time. HD-SDI monitoring is not affected by the transmission network and there will be no image delay caused by IP network monitoring. In real-time monitoring and high-definition requirements.
Advantage 5 Equipment utilization rate is high. The resolution of the HD-SDI device video output image is 1920×1080, and the camera dot density per unit area is greatly reduced. Provide more details on the monitoring site, such as seeing the face and seeing the license plate.
The product features of the HD-SDI system architecture design of the two HD-SDI product systems are overall compatible. To achieve true HD monitoring, video source acquisition, video signal processing, video signal transmission, and video display browsing must be implemented. The playback of video files and other links fully support high definition. For users, HD only makes sense when it includes front-end, transmission, browsing, display, platform, and storage. According to the characteristics of project site requirements, the system topology of HD-SDI products is generally divided into small and medium-sized ones.
The small HD-SDI system meets the characteristics of small space and small number of points, enabling real-time HD surveillance preview and storage. For small-scale monitoring systems, analog monitoring systems can be directly upgraded to HD-SDI high-definition monitoring systems. The original wiring of the system is not more than 100 meters between each device and the wire meets the "75-5" standard, and product replacement can be achieved.
For large HD-SDI systems, HD-SDI high-definition encoder compresses the front-end HD-SDI video signal to H due to the large number of front-end monitoring points and large amount of stored data. 264 network signals are stored in the IPSAN. There may be doubts from users why HD-SDI was eventually compressed via the Internet. Such questions can be answered through the topology diagram: After the HD-SDI front-end all-way high-definition real-time video enters the video distributor, all the way to the HD matrix can be previewed in real time, and all the video is distributed to the HD encoder alone for storage. High-definition live preview also guarantees HD storage.
According to the two HD solutions mentioned above, users can choose according to the application in the actual project. It is not difficult to see that the implementation of the entire project and the construction of the project are not too difficult for the project owner. The installation and use of the equipment is exactly the same as the analog monitoring system. The front-end dome can be controlled by using the keyboard to connect the optical transceiver through reverse data. The system's versatile choice of wiring and architecture is easy to navigate. However, for the HD-SDI digital HD system, there are also some hard indicators:
The biggest difference between the connection mode analog front end and the HD-SDI front end is that once the analog front end is connected badly or the interface is imaginary, the video signal will have horizontal stripes or jitter but the video can still be viewed, and the HD-SDI front end will be connected once. Bad or bad interface video will disappear. The frequency of the analog video is wavy, and the HD-SDI video frequency is broken. Some engineering practices are using to cut the BNC head and BNC header of the video cable directly. This method of operation has a great effect on the HD-SDI video output. Attenuation.
Transmission system wiring generally uses a standard 75-5 video cable. At present, the maximum transmission distance of HD-SDI is 100 meters. After the transmission distance is greater than 100 meters, the video disappears due to video attenuation. In long-distance transmission, the optical fiber can be used for transmission. This not only ensures the video quality but also ensures the stability of the video transmission.
When the output HD-SDI video is converted to HDMI signal through the converter, the video signal will be interfered with by different levels due to the various advantages of HDMI cables. The maximum distance tested at present is 20 meters, but the video signal will pass after 15 meters. Different levels of attenuation.
Display mode In the HD-SDI HD solution, there will be different brands of video signal amplifiers to extend the signal transmission distance, but due to the different brands of video sources at the front end, there will be compatibility issues and the video signals will not be output. Because broadcast-level HD-SDI monitors are expensive, they will not be used in actual monitoring projects, and HDMI-enabled HDTVs will be the first choice for display devices. Although different brands of HDTVs support HDMI signal input, they are defined. Different video input parameters lead to compatibility issues with different brands of HD-SDI video sources and the message "This format is not supported."
The problems mentioned in the above 4 points will form a constraint in the implementation of the HD-SDI project. However, the pre-project investigation and product testing can also be used to smoothly promote high-definition products.
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