Digital video recorders (DVRs) are the predecessor of the NVR recording device. DVRs are used with surveillance systems to record digitally formatted video that is saved to storage device. DVRs can be configured to record audio as well as video from closed-circuit television cameras.
Digital video recorders constitute fantastic tool as a security application to record video signals from closed circuit television cameras for detection and documentation purposes. Not only do they offer a major improvement in image quality compared to the older analogical video recording solution (the famous VCR), but the capacities of DVR far exceed the simple recording of video images.
A DVR CCTV system provides a multitude of advanced functions over VCR technology such as video searches by event, time, date and camera. The quality of the image recorded is subject to numerous control feature, allowing for high quality, high resolution shots, but also lower definition when high quality video is not required, thus saving disk space and allowing for longer continuous recording.
Automatic backup, remote backup and control, even on the run mobile surveillance broadcasted on a cell phone, almost everything is possible with the newest security DVR recorder.
Security DVRs may be categorized as being either based on a Personal computer or embedded. A PC DVR is a personal computer (PC) equipped with a video capture card and provided with a PC DVR software allowing for the capture, backup, and management of the recorded images and sound when applicable.
An embedded DVR is usually a part of a brand solution, associated with firmware operating system and recording options. Embedded DVR are usually found in large corporate security systems integrating comprehensive security solutions.
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