In the network video monitoring system system, the role of the front-end subsystem is mainly to realize the collection of audio, video data, switch alarm data of the monitoring point, audio and video coding compression and network transmission. The front-end equipment mainly includes:
1. Image coding equipment (digital video recorder DVR, embedded video server, network camera);
2. Audio and video acquisition equipment (camera, pickup);
3. PTZ / PTZ decoder;
4. Alarm input / output devices (switching devices, alarms, etc.).
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