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The analog signal is a current or voltage signal, and the magnitude of the current or voltage determines the strength of the signal. Analog signals and digital signals belong to two different formats of signals, and if the signals are transmitted between the two signals by the other party's wireless device, a signal conversion is required. If the analog signal to digital, or digital signal to analog signal, we are collectively referred to as digital-analog conversion. 
For example, when a wireless monitoring system is used as a solution, signal acquisition uses analog cameras. If it is not suitable for analog microwave transmission, wireless network transmission technology can be used. All analog camera signals at the front end go through encoders (analog signals to digital signals). Depending on the number of signal inputs, the encoder has three types of specifications: 1, single 2, 3 two, and four. The encoder can compress analog video, audio, 485 control, intercom functions, etc., and then output one network signal. Finally, through wireless networking transmission, the front-end signal is transmitted back to the monitoring center, and voice bi-directional transmission, intercom, and control functions are realized at the same time. 
The back-end monitoring platform host is generally based on the camera's signal source, such as analog cameras using DVR (analog hard disk recorders), network cameras using NVR (network hard disk recorders), and hybrid video recorders (HVR) supporting both analog and digital signals. Format camera. Because the front-end analog camera is compressed by the encoder, the back-end usually needs to decompress the network signal into an analog signal to access the monitoring host. 
The working principle of the decoder is to demodulate the network digital signal into an analog signal. The decoder also has audio output and input, intercom function, and 485 input. There are two types of decoders: 1. One channel (one channel for one image) and two channels (only one channel for video output, and one channel for video is loaded with four channels). 
The current video surveillance system is in the process of transition from analog video surveillance to digital video surveillance. The use of analog video surveillance or upgrading from analog video surveillance to digital surveillance and adopting a wired connection is the initial stage of the transition process of the surveillance system. The use of digital video surveillance and wireless connectivity will accelerate the transition of video surveillance. How does the original analog signal be converted into a digital signal? This is what we will be talking about in this section.