I. Explanation of terms:
1.1, 960H
The resolution of 960H refers to 960*576 (PAL system) or 960*480 (NTSC system), corresponding to D1 (704*576) is mainly the improvement of horizontal resolution.
Analog monitoring is the technical specification of the TV system adopted, mainly PAL system and NTSC system, adapted to CRT monitors, using interlaced scanning, vertical resolution, and the PAL system is commonly used in China. The line limit is 625 lines per second. 25 cells, odd field first, even field, plus AD conversion, transmission and other losses, generally can reach 400-500 lines, and then increase is basically impossible. Therefore, as an analog camera to enhance the quality, it can only start from the lifting of the horizontal resolution, 960H resolution is horizontally widened from 704 to 960.
1.2, HD-SDI
SDI (serial digital interface) is a "digital component serial interface." Then HD-SDI is a high-definition digital component serial interface. HD-SDI is a real-time, uncompressed, high-definition broadcast-grade camera. It is another technological advancement in the field of security monitoring, providing high-definition image source equipment for the monitoring center.
1.3, HDCVI
HDCVI (High Definition Composite Video Interface), a high-definition composite video interface, is a high-definition video transmission standard based on coaxial cable, and adopts analog modulation technology to transmit progressive high-definition video. The HDCVI HD composite video interface standard has fully independent intellectual property rights and is issued by Dahua.
1.4, HD-TVI
HD-TVI is the coaxial high-definition video transmission standard. It is a specification for high-definition video transmission based on coaxial cable. As a new analog HD solution, it can compensate for the existing analog high-definition defects in the market.
1.5, AHD
Analog High Definition means to simulate high resolution. In terms of High Definition, simply speaking, we usually refer to a format with a physical resolution of more than 720p as HD, or HD for short. The vertical resolution of the picture is 1080i, 720p or 1080p.1080i refers to a resolution of 1920×1080, adopts interlaced scanning and displays 30 full frames per second; 720p refers to a resolution of 1280×720, adopts sequential progressive scanning, and presents 60 full frames per second; 1080p is Finger resolution of 1920 × 1080, adopts sequential scanning, 60 full-frame images per second. And AHD is based on the AHD protocol, using analog coaxial cable transmission line-by-line scanning of high-definition video.
Second, the program comparison analysis
The development of 2.1960H for more than a decade, mature technology 960H analog HD, after 10 years of development has been fully mature. DVR is the core equipment in the digital video surveillance era. It involves functions such as video capture, encoding compression, decoding display, video storage, and network transmission. It can be used alone to form analog monitoring systems with analog cameras, and can also be used to form a more powerful module through the network. Mixed monitoring system. Due to the limitations of PAL/NTSC technology, the resolution of analog surveillance can only reach D1.
Over the years, DVR video resolution has always been the standard definition D1 image quality. Currently, it has been unable to meet the market demand for high-definition, and the market prospects are gradually being neglected. In this case, Sony alone introduced the Effio series of camera solutions that will resolve the resolution of analog cameras. The rate increased to 700 lines. People have found that in fact, analog can also be high-definition, and tied with the network HD and HD-SDI high-definition as the top three high-definition standards. Analog surveillance has revived its vitality and the market is re-optimistic about analog surveillance. In this case, the DVR, which is the core device of analog surveillance, will inevitably follow the trend of analog high-definition and fully apply the 960H technology to enhance the video recording and decoding display effect.
2.2. HD-SDI technology is not easy. Survival is not easy for those who are engaged in security video surveillance. HD-SDI technology is not new and familiar. In the phase of analog surveillance turning to high-definition monitoring, it was once called the mainstream trend of future development. Fact verification, it is a flash in the pan, gradually submerged in the network HD world.
HD-SDI refers to the high-definition digital component serial interface. It was established in 1990 by the HD-SDI HD serial digital interface standard. It is a world-standard protocol designed for broadcasting and television. It has no delay (or very low only) through coaxial cable transmission. (Feeling delayed), uncompressed, high-definition HD-SDI image signals. The application of this technology in the field of security monitoring plays an important role in promoting monitoring from simulation to high-definition.
Advantages: Reduced Cost of Conversion The high-definition HD-SDI solution that guarantees image quality is replaced on the basis of the original analog SD system, which saves costs. From standard definition to high definition, original analog and standard CCTV systems can be used to directly replace the front-end and back-end products of the HD-SDI interface. The upgrade to high-definition monitoring can be completed without replacing the original transmission network. The analog high-definition monitoring system is based on the original analog standard definition monitoring system. It does not require much time for training, nor does it need to cultivate the user's usage habits. The cost of product maintenance in the future will also be reduced. These features are very attractive to engineering and end users.
Defects: Short transmission distances, high networking costs, and high cable requirements Even though HD-SDI solutions have real-world needs and have their own advantages, their shortcomings have severely hindered their development. First of all, based on coaxial cable transmission, to reduce costs; Second, the operation and management and traditional analog SDTV CCTV system is similar, the operator is easy to use; again, non-compression is not distorted, maintaining the image of high-definition pixels. These advantages can indeed meet the needs of contractors and end-users, but the ideal is full, the reality is a sense of bone.
The HD-SDI solution has a short transmission distance. With the same cable transmission distance is only 100 meters. Faced with the current trend of network security monitoring, HD-SDI transmits non-IP digital signals. To achieve network monitoring, digital signals need to be IPized, which increases costs. As for the demand for supporting equipment, in order to popularize it must improve its supporting products and the prices are relatively expensive. Finally, the quality of the transmission cable is required to be high. If the coaxial cable does not reach the national standard, there will be problems with the transmission picture quality. The original project had a non-standard cable routing problem in terms of wiring.
2.3, HDCVI megapixel high-definition system advantages and the HD-SDI solution is facing the same background, HDCVI million HD is also committed to solving the high-definition simulation requirements. In contrast, HDCVI was released by Zhejiang Dahua Technology Co., Ltd., and its high-definition compliance with food interface standards has its own independent intellectual property rights. HDCVI, the high-definition composite video interface, is a high-definition video transmission standard based on coaxial cable and adopts analog modulation technology to transmit progressively scanned high-definition video. July 31, 2012 was issued by Zhejiang Dahua Technology Co., Ltd. and it has complete independent intellectual property rights. HDCVI HD solution mainly uses HDCVI technology DVR and analog cameras to form the basic subsystem. The DVR and NVS are used as the converged node devices, and the analog cameras are deployed in a star topology.
The HDCVI technology video surveillance system not only conforms to the analog SDTV camera system in terms of usage and installation, but also has the same interactive experience for user operations. The transmission medium can also directly use coaxial cables and connectors in the SD system. The construction and deployment personnel do not need to learn a great deal of professional assembly knowledge. They also have no special requirements for the quality of the cable and the connection process. They fully inherit the advantages of the analog SD system. There is no need for new training during the deployment of the new construction project. The reconstruction project can easily realize smooth transition and seamless upgrade based on the original system.
Advantages: cost-effective, easy to operate, safe and reliable, low cost HDCVI products are cost-effective. HDCVI's millions of high-definition screens satisfy the majority of users' demand for the quality of surveillance. The entry-level 720P HDCVI has been added to the traditional analog camera's price field, achieving a very high price/performance ratio. In addition to higher cost performance, its system architecture is simple and pure. The HDCVI system is a plug-and-play, simple, pure, real-time, delay-free transmission system. After the hardware lines are connected, the system can be used. It is one of the most simple and easy to use megapixel HD systems. Also because of the simplicity of the HDCVI system, the stability and reliability of the system are greatly guaranteed.
Closed-loop transmission - the protection of information security. The HDCVI system is closed-loop transmission and will not reveal any data. Therefore, in the high-security industries such as finance, analog systems with the same closed-loop transmission will be used.
Coaxial lines are not retrofitted, plug and play - upgrades are easy to upgrade. Products based on HDCVI technology can not only use the existing 75-3 cable, but also the transmission distance can reach more than 500 meters, you can also fully use the advantages of the original power lines, HDCVI strong application strength is fully revealed.
There are numerous product support and cooperation manufacturers. The products of the current HDCVI system are very complete, with 720P and 1080P at the front end, all of which can meet indoor and outdoor monitoring. There are guns, hemispheres, domes, etc. in the form of infrared light and non-infrared products. Illumination, wide dynamic demand products.
Defects: Front-end and back-end devices have high update cost and limited transmission distance. HDCVI is conceptually understood to be a high-definition video based on coaxial cable and adopting analog modulation technology to transmit progressive scan. It is an upgraded product under the analog surveillance technology architecture. It is a closed-circuit simulation monitoring system. In addition, HDCVI is only responsible for the signal acquisition is not responsible for the compression of the signal, the maximum limit by the transmission mode can only achieve 200w @ 30 frames, inevitably limited in high-definition picture quality. The front end of the HDCVI series products is uncompressed, resulting in a large amount of back-end data. Although some of the original analog-monitored transmission cables can be used for image transmission, the front-end, optical transceiver, and back-end need to be replaced. At the same time, the effective transmission distance of HDCVI is about 500 meters, and the attenuation of transmission signals above 500 meters is serious, and the scalability is general.
2.4. HD-TVI analog surveillance The new breakthrough HD-TVI is the coaxial high-definition video transmission standard. It is a specification for high-definition video transmission based on coaxial cable. As a new analog HD solution, it can make up for the current existence on the market. Analog HD flaws.
Advantages: Longer transmission distances, lower costs, less storage capacity The TVI can convert digital signals to analog, which will increase transmission distance, reduce overall costs, and require less storage capacity. Its transmission distance through the coaxial cable can reach 300~500 meters. In addition, TVI can transmit CVBS 75-ohm analog signals and achieve 30fps 1,080P and 720P transmissions, which are difficult to achieve with other high-definition coaxial solutions. Users can even replace their analog cameras and DVRs with TVI cameras and DVRs to get a new 1080P system without any special knowledge or additional labor costs.
Asia will be the first to adopt this technology market. Because in Asia, unstable bandwidth is still a headache for integrators who want to build reliable IP systems. On the other hand, many people still lack sufficient IP knowledge. These two factors hinder the promotion of IP systems in Asia. Therefore, about 50% of installers in Asia prefer to find solutions that are easy to use like CVI and TVI. Whether customers need a new system or only need to reconstruct a part of the project, it is almost impossible for them to completely abandon the existing analog system or coaxial cable. Therefore, companies should provide customers with products and methods that will be transferred to all-IP, including the integration of IP/HD-SDI and TVI, and will provide more practical and cost-effective solutions.
2.5. AHD attracts a wide range of attention from insiders: low cost, long distance, no delay, high efficiency, anti-jamming AHD is as simple and convenient as traditional equipment, and can reach up to 500 with an ordinary 75-3 coaxial cable. m HD lossless transmission, breaking the transmission limit of the existing transmission technology of high-definition video, can achieve low-cost, long-distance, no delay, high efficiency, anti-jamming and easy implementation of megapixel HD video transmission.
AHD follows the methods and methods of analog SD transmission, which can reduce the complexity of construction deployment, reduce the cost and maintenance complexity of auxiliary materials, and the technical requirements for construction personnel. It is very suitable for the upgrading of the old system. It can easily upgrade SD to HD without changing the original system. In addition, the high-definition standard definition price makes AHD have a very large space for development in the civil and industrial markets. AHDDVR is compatible with common analog cameras. We can see that AHD is undoubtedly another technological innovation in the high-definition market and will become a new trend in the security market.
2.6 The relative specifications of HDSDI are the highest, but the price is also the most expensive. In the new CVI, TVI, AHD, TVI specifications are relatively highest, but the problem is reflected in the weak transmission performance. When choosing the video amplification chip, CVI only needs more than 30 M chips, and TVI needs 70M. Subject to this specification, the transmission distance of TVI is the shortest, and the demand for wire rods is the highest. In fact, in practical applications, it is not important whether the coaxial HD can reach 500 meters. As far as the current analog HD image effect is concerned, it is still an image at 500 meters, but there is no guarantee of quality. Some engineering companies have stated that there is no problem when using a 75-3 cable to transmit at 300 meters, and noise is more obvious at 400 meters. In fact, from the perspective of engineering wiring, 500 meters does not have much practical value. Because more than 300 meters of wiring basically use optical transceivers. Therefore, to say 500 meters and 400 meters can be said that there is not much difference, or that excessive emphasis on transmission distance does not make much sense for coaxial HD.
Although there is not much difference between the HD HDCVI, HDTVI and AHD, there is a first-mover advantage in the first-to-market and the catch-up of latecomers is actually relatively hard. Since there is no banner for leading companies, they can only kill low prices. Moreover, in terms of performance, it is not advantageous in terms of performance, it is late in the world, and it is abandoned by the two giants. Therefore, AHD should only use the “price card†to break the arm to survive. Of course, this also logically explains why AHD is currently more popular in the security market in Shenzhen, where manufacturers are more sensitive to prices.
Third, the conclusion:
Video surveillance systems are moving toward high definition and networking, and traditional SD simulation will not be willing to quickly withdraw from the market. Under such circumstances, the application value of the 960H, HD-SDI, HDCVI, HD-TVI, and AHD will also be highlighted. Out. Although the environment has created such products, the destiny of these new technologies will be hard to come by when the high-definition network becomes mainstream. The final analog HD will gradually replace the traditional analog surveillance market.
1.1, 960H
The resolution of 960H refers to 960*576 (PAL system) or 960*480 (NTSC system), corresponding to D1 (704*576) is mainly the improvement of horizontal resolution.
Analog monitoring is the technical specification of the TV system adopted, mainly PAL system and NTSC system, adapted to CRT monitors, using interlaced scanning, vertical resolution, and the PAL system is commonly used in China. The line limit is 625 lines per second. 25 cells, odd field first, even field, plus AD conversion, transmission and other losses, generally can reach 400-500 lines, and then increase is basically impossible. Therefore, as an analog camera to enhance the quality, it can only start from the lifting of the horizontal resolution, 960H resolution is horizontally widened from 704 to 960.
1.2, HD-SDI
SDI (serial digital interface) is a "digital component serial interface." Then HD-SDI is a high-definition digital component serial interface. HD-SDI is a real-time, uncompressed, high-definition broadcast-grade camera. It is another technological advancement in the field of security monitoring, providing high-definition image source equipment for the monitoring center.
1.3, HDCVI
HDCVI (High Definition Composite Video Interface), a high-definition composite video interface, is a high-definition video transmission standard based on coaxial cable, and adopts analog modulation technology to transmit progressive high-definition video. The HDCVI HD composite video interface standard has fully independent intellectual property rights and is issued by Dahua.
1.4, HD-TVI
HD-TVI is the coaxial high-definition video transmission standard. It is a specification for high-definition video transmission based on coaxial cable. As a new analog HD solution, it can compensate for the existing analog high-definition defects in the market.
1.5, AHD
Analog High Definition means to simulate high resolution. In terms of High Definition, simply speaking, we usually refer to a format with a physical resolution of more than 720p as HD, or HD for short. The vertical resolution of the picture is 1080i, 720p or 1080p.1080i refers to a resolution of 1920×1080, adopts interlaced scanning and displays 30 full frames per second; 720p refers to a resolution of 1280×720, adopts sequential progressive scanning, and presents 60 full frames per second; 1080p is Finger resolution of 1920 × 1080, adopts sequential scanning, 60 full-frame images per second. And AHD is based on the AHD protocol, using analog coaxial cable transmission line-by-line scanning of high-definition video.
Second, the program comparison analysis
The development of 2.1960H for more than a decade, mature technology 960H analog HD, after 10 years of development has been fully mature. DVR is the core equipment in the digital video surveillance era. It involves functions such as video capture, encoding compression, decoding display, video storage, and network transmission. It can be used alone to form analog monitoring systems with analog cameras, and can also be used to form a more powerful module through the network. Mixed monitoring system. Due to the limitations of PAL/NTSC technology, the resolution of analog surveillance can only reach D1.
Over the years, DVR video resolution has always been the standard definition D1 image quality. Currently, it has been unable to meet the market demand for high-definition, and the market prospects are gradually being neglected. In this case, Sony alone introduced the Effio series of camera solutions that will resolve the resolution of analog cameras. The rate increased to 700 lines. People have found that in fact, analog can also be high-definition, and tied with the network HD and HD-SDI high-definition as the top three high-definition standards. Analog surveillance has revived its vitality and the market is re-optimistic about analog surveillance. In this case, the DVR, which is the core device of analog surveillance, will inevitably follow the trend of analog high-definition and fully apply the 960H technology to enhance the video recording and decoding display effect.
2.2. HD-SDI technology is not easy. Survival is not easy for those who are engaged in security video surveillance. HD-SDI technology is not new and familiar. In the phase of analog surveillance turning to high-definition monitoring, it was once called the mainstream trend of future development. Fact verification, it is a flash in the pan, gradually submerged in the network HD world.
HD-SDI refers to the high-definition digital component serial interface. It was established in 1990 by the HD-SDI HD serial digital interface standard. It is a world-standard protocol designed for broadcasting and television. It has no delay (or very low only) through coaxial cable transmission. (Feeling delayed), uncompressed, high-definition HD-SDI image signals. The application of this technology in the field of security monitoring plays an important role in promoting monitoring from simulation to high-definition.
Advantages: Reduced Cost of Conversion The high-definition HD-SDI solution that guarantees image quality is replaced on the basis of the original analog SD system, which saves costs. From standard definition to high definition, original analog and standard CCTV systems can be used to directly replace the front-end and back-end products of the HD-SDI interface. The upgrade to high-definition monitoring can be completed without replacing the original transmission network. The analog high-definition monitoring system is based on the original analog standard definition monitoring system. It does not require much time for training, nor does it need to cultivate the user's usage habits. The cost of product maintenance in the future will also be reduced. These features are very attractive to engineering and end users.
Defects: Short transmission distances, high networking costs, and high cable requirements Even though HD-SDI solutions have real-world needs and have their own advantages, their shortcomings have severely hindered their development. First of all, based on coaxial cable transmission, to reduce costs; Second, the operation and management and traditional analog SDTV CCTV system is similar, the operator is easy to use; again, non-compression is not distorted, maintaining the image of high-definition pixels. These advantages can indeed meet the needs of contractors and end-users, but the ideal is full, the reality is a sense of bone.
The HD-SDI solution has a short transmission distance. With the same cable transmission distance is only 100 meters. Faced with the current trend of network security monitoring, HD-SDI transmits non-IP digital signals. To achieve network monitoring, digital signals need to be IPized, which increases costs. As for the demand for supporting equipment, in order to popularize it must improve its supporting products and the prices are relatively expensive. Finally, the quality of the transmission cable is required to be high. If the coaxial cable does not reach the national standard, there will be problems with the transmission picture quality. The original project had a non-standard cable routing problem in terms of wiring.
2.3, HDCVI megapixel high-definition system advantages and the HD-SDI solution is facing the same background, HDCVI million HD is also committed to solving the high-definition simulation requirements. In contrast, HDCVI was released by Zhejiang Dahua Technology Co., Ltd., and its high-definition compliance with food interface standards has its own independent intellectual property rights. HDCVI, the high-definition composite video interface, is a high-definition video transmission standard based on coaxial cable and adopts analog modulation technology to transmit progressively scanned high-definition video. July 31, 2012 was issued by Zhejiang Dahua Technology Co., Ltd. and it has complete independent intellectual property rights. HDCVI HD solution mainly uses HDCVI technology DVR and analog cameras to form the basic subsystem. The DVR and NVS are used as the converged node devices, and the analog cameras are deployed in a star topology.
The HDCVI technology video surveillance system not only conforms to the analog SDTV camera system in terms of usage and installation, but also has the same interactive experience for user operations. The transmission medium can also directly use coaxial cables and connectors in the SD system. The construction and deployment personnel do not need to learn a great deal of professional assembly knowledge. They also have no special requirements for the quality of the cable and the connection process. They fully inherit the advantages of the analog SD system. There is no need for new training during the deployment of the new construction project. The reconstruction project can easily realize smooth transition and seamless upgrade based on the original system.
Advantages: cost-effective, easy to operate, safe and reliable, low cost HDCVI products are cost-effective. HDCVI's millions of high-definition screens satisfy the majority of users' demand for the quality of surveillance. The entry-level 720P HDCVI has been added to the traditional analog camera's price field, achieving a very high price/performance ratio. In addition to higher cost performance, its system architecture is simple and pure. The HDCVI system is a plug-and-play, simple, pure, real-time, delay-free transmission system. After the hardware lines are connected, the system can be used. It is one of the most simple and easy to use megapixel HD systems. Also because of the simplicity of the HDCVI system, the stability and reliability of the system are greatly guaranteed.
Closed-loop transmission - the protection of information security. The HDCVI system is closed-loop transmission and will not reveal any data. Therefore, in the high-security industries such as finance, analog systems with the same closed-loop transmission will be used.
Coaxial lines are not retrofitted, plug and play - upgrades are easy to upgrade. Products based on HDCVI technology can not only use the existing 75-3 cable, but also the transmission distance can reach more than 500 meters, you can also fully use the advantages of the original power lines, HDCVI strong application strength is fully revealed.
There are numerous product support and cooperation manufacturers. The products of the current HDCVI system are very complete, with 720P and 1080P at the front end, all of which can meet indoor and outdoor monitoring. There are guns, hemispheres, domes, etc. in the form of infrared light and non-infrared products. Illumination, wide dynamic demand products.
Defects: Front-end and back-end devices have high update cost and limited transmission distance. HDCVI is conceptually understood to be a high-definition video based on coaxial cable and adopting analog modulation technology to transmit progressive scan. It is an upgraded product under the analog surveillance technology architecture. It is a closed-circuit simulation monitoring system. In addition, HDCVI is only responsible for the signal acquisition is not responsible for the compression of the signal, the maximum limit by the transmission mode can only achieve 200w @ 30 frames, inevitably limited in high-definition picture quality. The front end of the HDCVI series products is uncompressed, resulting in a large amount of back-end data. Although some of the original analog-monitored transmission cables can be used for image transmission, the front-end, optical transceiver, and back-end need to be replaced. At the same time, the effective transmission distance of HDCVI is about 500 meters, and the attenuation of transmission signals above 500 meters is serious, and the scalability is general.
2.4. HD-TVI analog surveillance The new breakthrough HD-TVI is the coaxial high-definition video transmission standard. It is a specification for high-definition video transmission based on coaxial cable. As a new analog HD solution, it can make up for the current existence on the market. Analog HD flaws.
Advantages: Longer transmission distances, lower costs, less storage capacity The TVI can convert digital signals to analog, which will increase transmission distance, reduce overall costs, and require less storage capacity. Its transmission distance through the coaxial cable can reach 300~500 meters. In addition, TVI can transmit CVBS 75-ohm analog signals and achieve 30fps 1,080P and 720P transmissions, which are difficult to achieve with other high-definition coaxial solutions. Users can even replace their analog cameras and DVRs with TVI cameras and DVRs to get a new 1080P system without any special knowledge or additional labor costs.
Asia will be the first to adopt this technology market. Because in Asia, unstable bandwidth is still a headache for integrators who want to build reliable IP systems. On the other hand, many people still lack sufficient IP knowledge. These two factors hinder the promotion of IP systems in Asia. Therefore, about 50% of installers in Asia prefer to find solutions that are easy to use like CVI and TVI. Whether customers need a new system or only need to reconstruct a part of the project, it is almost impossible for them to completely abandon the existing analog system or coaxial cable. Therefore, companies should provide customers with products and methods that will be transferred to all-IP, including the integration of IP/HD-SDI and TVI, and will provide more practical and cost-effective solutions.
2.5. AHD attracts a wide range of attention from insiders: low cost, long distance, no delay, high efficiency, anti-jamming AHD is as simple and convenient as traditional equipment, and can reach up to 500 with an ordinary 75-3 coaxial cable. m HD lossless transmission, breaking the transmission limit of the existing transmission technology of high-definition video, can achieve low-cost, long-distance, no delay, high efficiency, anti-jamming and easy implementation of megapixel HD video transmission.
AHD follows the methods and methods of analog SD transmission, which can reduce the complexity of construction deployment, reduce the cost and maintenance complexity of auxiliary materials, and the technical requirements for construction personnel. It is very suitable for the upgrading of the old system. It can easily upgrade SD to HD without changing the original system. In addition, the high-definition standard definition price makes AHD have a very large space for development in the civil and industrial markets. AHDDVR is compatible with common analog cameras. We can see that AHD is undoubtedly another technological innovation in the high-definition market and will become a new trend in the security market.
2.6 The relative specifications of HDSDI are the highest, but the price is also the most expensive. In the new CVI, TVI, AHD, TVI specifications are relatively highest, but the problem is reflected in the weak transmission performance. When choosing the video amplification chip, CVI only needs more than 30 M chips, and TVI needs 70M. Subject to this specification, the transmission distance of TVI is the shortest, and the demand for wire rods is the highest. In fact, in practical applications, it is not important whether the coaxial HD can reach 500 meters. As far as the current analog HD image effect is concerned, it is still an image at 500 meters, but there is no guarantee of quality. Some engineering companies have stated that there is no problem when using a 75-3 cable to transmit at 300 meters, and noise is more obvious at 400 meters. In fact, from the perspective of engineering wiring, 500 meters does not have much practical value. Because more than 300 meters of wiring basically use optical transceivers. Therefore, to say 500 meters and 400 meters can be said that there is not much difference, or that excessive emphasis on transmission distance does not make much sense for coaxial HD.
Although there is not much difference between the HD HDCVI, HDTVI and AHD, there is a first-mover advantage in the first-to-market and the catch-up of latecomers is actually relatively hard. Since there is no banner for leading companies, they can only kill low prices. Moreover, in terms of performance, it is not advantageous in terms of performance, it is late in the world, and it is abandoned by the two giants. Therefore, AHD should only use the “price card†to break the arm to survive. Of course, this also logically explains why AHD is currently more popular in the security market in Shenzhen, where manufacturers are more sensitive to prices.
Third, the conclusion:
Video surveillance systems are moving toward high definition and networking, and traditional SD simulation will not be willing to quickly withdraw from the market. Under such circumstances, the application value of the 960H, HD-SDI, HDCVI, HD-TVI, and AHD will also be highlighted. Out. Although the environment has created such products, the destiny of these new technologies will be hard to come by when the high-definition network becomes mainstream. The final analog HD will gradually replace the traditional analog surveillance market.
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