CCTV DVR
Digital Video Recorders (DVR) record video images captured by cameras and stored them digitally on hard disks. Compared to the old medium of video cassette tapes, hard disks are far more superior in the ease of storage, backup and retrieval. And unlike tapes that can go moldy over time, affecting picture quality, hard disk does not have these limitation. It is hence little wonder that the Digital Video Recorders are fast replacing the older Time Lapsed Video Recorders.
There are three types of Digital Video Recorders:
- Embedded DVR
- PC Based DVR
- Network Video Recorder (NVR)
Embedded DVR comes complete with its own proprietary operating systems, Graphical User Interface and display capability and may include interface for mouse, panel and remote controller. It is typically equipped with at least one USB port for backup to thumb drives or other portable external hard disks.
PC-Based DVR are really personal computer installed with system specific video captured cards. The Video Capture Card may support 4 or 8 cameras, and will take up 1 PC Slot. A dedicated DVR software is installed, running on Windows or Linux platform.
Network Video Recorder (NVR) are computers set up as network servers, linked to a group of network (IP) cameras for recording and monitoring of the digital images captured and transmitted by the IP Digital Cameras.