How decoder works
Decoder is an important control device that inputs analog video signal and converts it into digital signal format. Under the control of the host, it can make the front-end devices produce corresponding actions. Decoder can be divided into software decoder and hardware decoder.
What's the use of decoder
Decoder is to convert the communication signal transmitted from the host (matrix or DVR) through the communication line into the level signal through self decoding. To control the camera and pan tilt. Some decoders can recognize multi protocol automatically or select by dial switch. Camera and PTZ need to be controlled. There is often more than one camera and PTZ, but the control equipment sends out a series of control signals from the main equipment, such as keyboard or DVR. How can each equipment know whether it is sent to itself? This requires the decoder to identify. The decoder can identify whether the control signal from the host is "sent to itself", which is its role.
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