A DVR or CCTV digital video recorder is a computer that saves security video images to a hard drive. Most security cameras usually capture an analogue picture and the DVR converts the analogue signal to digital and then compresses it.
Digital video recorders configured for physical security applications record video signals from closed-circuit television cameras for detection and documentation purposes and designed to record audio as well.
A DVR CCTV system provides a multitude of advanced functions over VCR technology including video searches by event, time, date and camera. There is also much more control over quality and frame rate allowing disk space usage to be optimized and the DVR can also be set to overwrite the oldest security footage.
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