What is a DVR digital video recorder

DVR (Digital Video Recorder) is a digital video recorder, which has two characteristics of digitization and video recording in terms of name. Therefore, it is a computer system that realizes image digital storage processing. DVR emerged in the second phase of the development of video surveillance systems, namely the semi-digital era, and was used to replace analog video recorders. Early security video surveillance used analog monitors and video tape recorders. However, the tapes used in tape recordings were expensive, had a short life, a small capacity, and had poor image quality, which greatly restricted the development of video surveillance. The video signal is encoded as a digital signal and stored on the hard disk. It is far superior to analog monitoring equipment in image processing, storage, retrieval, backup, network transmission, and remote control. The DVR's huge advantage of using digital recording technology has enabled DVR to quickly replace analog video recorders.