What is video transmission

1. Video Cable Transmission Video cable transmission is the simplest transmission method. The video cables are SYV-75-3, SYV-75-5, SYV-75-7 and other models. The mantissa in the model represents the centerline diameter of the coaxial cable. The larger the value is, the longer the transmission distance is.

The main drawback of the electrical transmission is the poor anti-interference ability. According to the characteristics of the coaxial cable, the shielding layer has a poorer shielding effect on the electromagnetic wave with a lower frequency. Therefore, the coaxial cable is easily interfered by broadcasting and low-frequency electromagnetic waves. The interference of radio broadcasting to the image shows a more stable moire pattern to the image. The best way to suppress this interference is to lay the cables buried in the ground, and symmetrically balanced cables with outer shields can also be used as transmission lines. When only the coaxial cable can be used, the cable shield should be grounded at one end, and a symmetrical input cable compensator should be installed at the receiving end. The transmission of the signal up to 5-8V can also better suppress the interference of broadcasting and other lower frequency electromagnetic pulses.

The interference from the 220V power supply causes the image to produce a horizontal black race. The main cause of this interference is the difference in ground potential. The best method for suppressing the dryness caused by the difference in ground potential is to use a single-ended grounding of the cable, which is generally grounded at the control end and ungrounded at the camera end.

2. Telephone line transmission For the occasions with large dispersion and distant distances such as mines and oil fields, laying cables is often inconvenient. If the image quality requirements are not very high, you can use the telephone line transmission. Through digital image processing technology, the video signal can be compressed and transmitted to the remote end through the existing telephone network. Due to the narrow bandwidth of the telephone line, images cannot be transmitted in real time, typically 3-15 frames per second. Send an image in slow seconds.

3, optical fiber transmission Optical fiber transmission has a long distance, capacity, anti-interference ability and other advantages, often used in long-distance multiple transmission systems.

4. Digital microwave network system transmission The metropolitan area network digital transmission system is a large-scale metropolitan area digital monitoring system network integrating remote digital transmission system and digital microwave network.

The system features:

1.> Smooth and clear digital picture. The unique video compression technology combined with the digital broadband of the digital microwave metropolitan area network, the 10M broadband network enables the JL-CDTS to have a smooth picture that other remote monitoring systems do not have. Because of its use of digital video transmission, it ensures that its monitoring picture is clear and attenuated.

2.> Highly confidential. Compared with the traditional remote monitoring system for microwave images, this system has unprecedented security because it integrates digital video into the digital microwave network of modern computers. It is divided into microwave encryption layer, network encryption layer, software algorithm encryption layer, and login authority. The authentication layer four-layer encryption makes the remote transmission image highly confidential and fundamentally eliminates unauthorized users from stealing surveillance images.

3.> Safe and reliable remote control. Because this system has a high degree of confidentiality, the system has opened almost all remote control functions, allowing users to freely control remotely after being authorized.

4.> The system is highly flexible. The non-contact data link nature of microwaves has given the system a high degree of flexibility. The monitoring point is no longer limited to a fixed location. It can extend the surveillance system to vehicle-mounted dynamic surveillance, making this system powerful in areas that require dynamic surveillance such as traffic, firefighting, 110 linkage, medical emergency, post and telecommunications, banking securities, etc. The vitality.

5.> Highly scalable. The digital microwave network system provides an interface between the monitoring system and the database network system, making remote command and remote information sharing a reality.