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Digital Video Recorder (DVR), also known as Digital Video Recorder, uses hard disk recording compared to traditional analog video recorders, and is often referred to as Hard Disk Recorder or DVR. It is a computer system for image storage and processing, which has the functions of long-term recording, recording, remote monitoring, and control of images/voice. DVR adopts digital recording technology, which is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission, remote control, and other aspects. DVR represents the development direction of television monitoring systems.