Video multiplexer function and principle and control wiring skills

  The principles and functions, video multiplexer
The so-called video multiplexing is the use of video modulation principle, multiple video signal into different frequency, multi frequency signal is then modulated by mixing, and then using a video line (SYV75 Series) or radio frequency line (SYWV75 Series) for transmission, so the video multiplexer is also called isdn. To control the use of video demodulation technology center will be different high frequency signals are synchronous demodulation into video signal, so as to realize the multi-channel video signals are multiplexed to a transmission line, in order to achieve the purpose of saving transmission cable.
Classification and application of two, video multiplexing
According to the principle of the video multiplexing, we will be video signals are modulated into different frequency, can also be a control signal (RS485 signal) and audio signal modulation and demodulation, using a video line (SYV75 Series) or radio frequency line (SYWV75 Series) to transport.
Video multiplexing is divided into the following categories:
(1) video multiplexer: the video signal into a radio frequency signal and then mixing, a line to the room to use, reduction and then synchronous demodulation into video signal.
Including: 2 video multiplexer, 3 channel video multiplexer, 4 channel video multiplexer, 5 channel video multiplexer, 6 channel video multiplexer, 7 channel video multiplexer, 8 channel video multiplexer, 16 channel video multiplexer;
(2) audio video multiplexer:
Namely: the 1 audio signal and the 1 video signal into the RF signal and modulation, a line to the room to use, reduction and then synchronous demodulation into audio signals and video signals;
(3) data video multiplexer:
Namely: the 1 RS485 control signal and the 1 or more video signals at the same time modulation and then mixing using a transmission cable to the computer room, then synchronization demodulating the Chen RS485 signals and video signals (including 485 signal reverse transmission).
Characteristics and advantages of the three, video multiplexer
Video multiplexer is the modulation and demodulation technology, audio and video signal and the data signal is simulated using the FM and am modulation, the signal of 0 8M into the high frequency signal of 30 - 100M, and greatly improve the transmission characteristics of the audio and video signal and anti-jamming ability. Because can realize the multi-channel signal transmission so as to reduce the number of project wiring also reduced the number of pipe laying in one cable, which further reduces the difficulty of the project, reduce the wiring labor cost, achieve Province, province, province artificial pipe line!
Four typical examples of application, video multiplexer
Examples: (a) has been doing a good job of engineering a transmission line fault how to do?
Answer: if do engineering one way video line broken, the usual way is to re laying new video line or will break out again through a video line, this method is usually very labor-intensive, we recommend the use of a set of 2 channel video multiplexer, to solve at the same time 2 video transmission using a video line sideways, this method of construction is very convenient, cost is low, as shown below:
Example (two): the project has been completed, demand increased do one or more cameras?
Answer: this kind of problem is very common, often in the project after Party A will propose to increase the monitoring point requirements, usually way is only tube cable trench wear again, very labour and material consuming, we recommend the use of a set of 2 (or 5) video multiplexer, using a video line. At the same time transfer 2 (or 5) video to solve, this method of construction is very convenient, cost is low, as shown below:
Example (three): engineering construction process less equipped with a data control line how to do?
Answer: because the construction personnel careless or party a change request to a fixed camera point into a pan tilt zoom control point, leading to the project construction process less equipped with a data control line, this often happens, the usual solution can only be re laying a control line, so take a lot of work, we recommend the use of a set of coaxial visual control device (single channel video multiplexer), also transmit 1 video and 1 road 485 data signals to solve using a video cable laying good, this method of construction is very convenient, cost is low, as shown below:
Example (four): adding a monitor in a camera side (audio) how to do?
Answer: some of the items will need to increase the monitoring in the monitoring point near completion (pickup), the usual practice is to lay the audio line, very labour and material consuming, we recommend the use of a single channel audio and video multiplexer, the simultaneous transmission of 1 video and 1 audio signals to solve using a video cable laying well, this method of construction is very convenient, cost is low, as shown below:
Example (five): the project budget, how to reduce construction costs and improve competitiveness?
Answer: the current security field competition is very fierce, how to reduce the project cost and construction cost in project bidding and construction to improve the engineering company's competitiveness is the majority of projects are very concerned about the issue, the transmission equipment monitoring in addition to the specified equipment brand, quantity and construction personnel can reduce the cost of the wire, pipe is artificial fees, construction scheme of traditional hard to save in this regard, we strongly recommend the project developers use video multiplexing technology to implement, the video signal multiplexer can simultaneously transmit 2-8 by a line, a 485 control signal can transmit simultaneously, thus greatly saving video wire, or pipe laying smaller caliber. At the same time, the construction difficulty is greatly reduced and even into a