First, the principle and function of video multiplexer
The so-called video multiplexing uses the principle of video modulation to modulate multiple videos into different frequencies, then mixes the modulated multiple high-frequency signals, and then uses a video line (SYV75 series) or radio frequency line (SYWV75). After transmission to the control center, video demodulation technology is used to demodulate different high-frequency signals synchronously and restore them into video signals. This realizes the multiplexing of multiplexed video signals onto a single line to achieve transmission line savings. The purpose of the cable.
Second, the classification and use of video multiplexing
According to the principle of video multiplexing described above, we modulate multiple video signals into different frequencies, and we can also modulate and demodulate control signals (RS485 signals) and audio signals. Both use a video cable (SYV75 series) or RF line (SYWV75 series) to transmit, taking into account the actual situation in the current security monitoring project, Shanghai Enterprise Hui Industrial Co., Ltd. R & D and production of video multiplexing is divided into the following categories:
(1) Video Multiplexer: Multi-channel video signals are modulated into radio frequency signals and then mixed. They are transmitted to the computer room using a single line, and are then synchronously demodulated and restored to a video signal.
Including: 2 video multiplexers, 3 video multiplexers, 4 video multiplexers, 5 video multiplexers, 6 video multiplexers, 7 video multiplexers, 8 video multiplexers ;
(2) Audio Video Multiplexer: That is, the 1 channel audio signal and 1 channel video signal are simultaneously modulated into a radio frequency signal, transmitted to the computer room using a single line, and then synchronously demodulated and restored to an audio signal and a video signal;
(3) Data Video Multiplexer: That is, 1 channel of RS485 control signal and 1 or more channels of video signal are modulated at the same time and then mixed and transmitted to the computer room using a transmission cable, and then synchronously demodulated to restore Chen RS485 signal and video. Signal (where 485 signal is transmitted in reverse).
Third, video multiplexer features and advantages
The video multiplexer uses modulation and demodulation technology, which means that the analog audio and video signals and data signals are modulated by means of frequency modulation and amplitude modulation, thus converting the 0-8M signal into a 30-100M high frequency signal. Improve the audio and video signal transmission characteristics and anti-jamming capabilities. Because it can realize the transmission of multiple signals on one cable, it greatly reduces the number of engineering wiring and also reduces the number of laying pipes. This can further reduce the difficulty of engineering, reduce the labor cost of wiring, and achieve provincial and provincial management. Provincial labor!
IV. Typical Application Examples of Video Multiplexers (I): What should I do if a transmission line is broken?
A: If one of the video lines in the project is broken, the usual solution is to re-lay a new video cable or pull out a broken cable to re-enter a video cable. This method is usually very laborious. We recommend one. Set of 2-way video multiplexer, using a single video cable at the same time to transmit 2-channel video to solve, this method is very convenient to construct, the cost is low, as shown below:
Example (2): What should I do if one or more monitoring heads are added after the project is completed?
A: This kind of problem is very common. Party A often raises the requirement of increasing monitoring points after the project is completed. The usual method can only be to re-ditch the pipe and pull the cable, which is very expensive and expensive. Here we recommend a set of The 2-way (or 5-way) video multiplexer uses a video line at the edge to transmit two (or five) video streams at the same time to solve the problem. This method is very easy to construct and has a low cost, as shown in the following figure:
Example (3): What to do if there are few data control lines in the construction process?
A: Due to carelessness of the construction staff or changes in the requirements of Party A, the desire to change the fixed camera point to the zoom monitoring point of the PTZ has led to the laying of less data control lines during the construction of the project. This situation also occurs from time to time. The usual solution can only be restarted. The laying of a control line is very labor-intensive. In this case, we recommend using a coaxial video controller (single-channel video data multiplexer) to transmit one video and one video at the same time using a single video cable. Road 485 data signal to solve, this method is very convenient construction, low cost.
Example (4): What if I add a monitor (audio) next to a camera?
A: Some projects will require monitoring (pickups) to be added near the monitoring point after completion of the project. The usual practice is to re-lay audio cables. This is very wasteful. Here we recommend a single channel video/audio multiplexer. A video cable installed to transmit one video and one audio signal at the same time to solve, this method is very convenient and low cost.
Example (5): There are few project budgets. How to reduce construction costs and improve competitiveness?
A: The current competition in the field of security is very fierce. In the project bidding and construction, how to reduce engineering costs and construction costs to improve the competitiveness of the engineering company is a major concern for the majority of engineering companies. Monitoring projects in addition to the specified equipment brand, can The cost reduction is the number of wire rods, pipelines and labor costs for construction workers. The traditional construction scheme is difficult to save in this regard. We strongly recommend that the engineering firm implement the video multiplexing technology and the video multiplexer can use one line at the same time. The transmission of 2-8 video signals can also transmit 485 control signals at the same time. This greatly saves video cables and can also lay smaller diameter pipelines. At the same time, the difficulty of construction is greatly reduced and the construction man-hours fee is further reduced. Line, provincial, provincial labor!
V. Market Status Quo and Application Prospects of Video Multiplexers
In summary, the video multiplexer is a product that adopts a demodulation and demodulation technology and can simultaneously transmit multiple channels of video signals, audio signals, and data (RS485) signals on a single line, and can be greatly reduced using a video multiplexer. Monitor engineering construction costs, improve video transmission quality, and improve signal anti-jamming capability. At the same time, this product can also solve various problems in engineering wiring. It is no exaggeration to say that the video multiplexer is a magic weapon for video surveillance wiring. As a security construction engineer or project manager, it is possible to familiarize with and skillfully use video multiplexers to greatly improve the construction team's construction capacity and reduce Construction costs increase the technical level and competitiveness of construction units in the industry!
The so-called video multiplexing uses the principle of video modulation to modulate multiple videos into different frequencies, then mixes the modulated multiple high-frequency signals, and then uses a video line (SYV75 series) or radio frequency line (SYWV75). After transmission to the control center, video demodulation technology is used to demodulate different high-frequency signals synchronously and restore them into video signals. This realizes the multiplexing of multiplexed video signals onto a single line to achieve transmission line savings. The purpose of the cable.
Second, the classification and use of video multiplexing
According to the principle of video multiplexing described above, we modulate multiple video signals into different frequencies, and we can also modulate and demodulate control signals (RS485 signals) and audio signals. Both use a video cable (SYV75 series) or RF line (SYWV75 series) to transmit, taking into account the actual situation in the current security monitoring project, Shanghai Enterprise Hui Industrial Co., Ltd. R & D and production of video multiplexing is divided into the following categories:
(1) Video Multiplexer: Multi-channel video signals are modulated into radio frequency signals and then mixed. They are transmitted to the computer room using a single line, and are then synchronously demodulated and restored to a video signal.
Including: 2 video multiplexers, 3 video multiplexers, 4 video multiplexers, 5 video multiplexers, 6 video multiplexers, 7 video multiplexers, 8 video multiplexers ;
(2) Audio Video Multiplexer: That is, the 1 channel audio signal and 1 channel video signal are simultaneously modulated into a radio frequency signal, transmitted to the computer room using a single line, and then synchronously demodulated and restored to an audio signal and a video signal;
(3) Data Video Multiplexer: That is, 1 channel of RS485 control signal and 1 or more channels of video signal are modulated at the same time and then mixed and transmitted to the computer room using a transmission cable, and then synchronously demodulated to restore Chen RS485 signal and video. Signal (where 485 signal is transmitted in reverse).
Third, video multiplexer features and advantages
The video multiplexer uses modulation and demodulation technology, which means that the analog audio and video signals and data signals are modulated by means of frequency modulation and amplitude modulation, thus converting the 0-8M signal into a 30-100M high frequency signal. Improve the audio and video signal transmission characteristics and anti-jamming capabilities. Because it can realize the transmission of multiple signals on one cable, it greatly reduces the number of engineering wiring and also reduces the number of laying pipes. This can further reduce the difficulty of engineering, reduce the labor cost of wiring, and achieve provincial and provincial management. Provincial labor!
IV. Typical Application Examples of Video Multiplexers (I): What should I do if a transmission line is broken?
A: If one of the video lines in the project is broken, the usual solution is to re-lay a new video cable or pull out a broken cable to re-enter a video cable. This method is usually very laborious. We recommend one. Set of 2-way video multiplexer, using a single video cable at the same time to transmit 2-channel video to solve, this method is very convenient to construct, the cost is low, as shown below:
Example (2): What should I do if one or more monitoring heads are added after the project is completed?
A: This kind of problem is very common. Party A often raises the requirement of increasing monitoring points after the project is completed. The usual method can only be to re-ditch the pipe and pull the cable, which is very expensive and expensive. Here we recommend a set of The 2-way (or 5-way) video multiplexer uses a video line at the edge to transmit two (or five) video streams at the same time to solve the problem. This method is very easy to construct and has a low cost, as shown in the following figure:
Example (3): What to do if there are few data control lines in the construction process?
A: Due to carelessness of the construction staff or changes in the requirements of Party A, the desire to change the fixed camera point to the zoom monitoring point of the PTZ has led to the laying of less data control lines during the construction of the project. This situation also occurs from time to time. The usual solution can only be restarted. The laying of a control line is very labor-intensive. In this case, we recommend using a coaxial video controller (single-channel video data multiplexer) to transmit one video and one video at the same time using a single video cable. Road 485 data signal to solve, this method is very convenient construction, low cost.
Example (4): What if I add a monitor (audio) next to a camera?
A: Some projects will require monitoring (pickups) to be added near the monitoring point after completion of the project. The usual practice is to re-lay audio cables. This is very wasteful. Here we recommend a single channel video/audio multiplexer. A video cable installed to transmit one video and one audio signal at the same time to solve, this method is very convenient and low cost.
Example (5): There are few project budgets. How to reduce construction costs and improve competitiveness?
A: The current competition in the field of security is very fierce. In the project bidding and construction, how to reduce engineering costs and construction costs to improve the competitiveness of the engineering company is a major concern for the majority of engineering companies. Monitoring projects in addition to the specified equipment brand, can The cost reduction is the number of wire rods, pipelines and labor costs for construction workers. The traditional construction scheme is difficult to save in this regard. We strongly recommend that the engineering firm implement the video multiplexing technology and the video multiplexer can use one line at the same time. The transmission of 2-8 video signals can also transmit 485 control signals at the same time. This greatly saves video cables and can also lay smaller diameter pipelines. At the same time, the difficulty of construction is greatly reduced and the construction man-hours fee is further reduced. Line, provincial, provincial labor!
V. Market Status Quo and Application Prospects of Video Multiplexers
In summary, the video multiplexer is a product that adopts a demodulation and demodulation technology and can simultaneously transmit multiple channels of video signals, audio signals, and data (RS485) signals on a single line, and can be greatly reduced using a video multiplexer. Monitor engineering construction costs, improve video transmission quality, and improve signal anti-jamming capability. At the same time, this product can also solve various problems in engineering wiring. It is no exaggeration to say that the video multiplexer is a magic weapon for video surveillance wiring. As a security construction engineer or project manager, it is possible to familiarize with and skillfully use video multiplexers to greatly improve the construction team's construction capacity and reduce Construction costs increase the technical level and competitiveness of construction units in the industry!
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