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Security applications
Digital video recorders configured for physical security applications record
video signals from closed circuit television cameras for detection and
documentation purposes. Many are designed to record audio as well. DVRs have
evolved into devices that are feature rich and provide services that exceed the
simple recording of video images that was previously done through VCRs. 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
should the disk become full. In some DVR security systems remote access to
security footage using a PC can also be achieved by connecting the DVR to a LAN
network or the internet.
Security DVRs may be categorized as being either PC based or embedded. A PC
based DVR’s architecture is a classical personal computer with video capture
cards designed to capture video images. An embedded type DVR is specifically
designed as a digital video recorder with its operating system and application
software contained in firmware or read only memory.
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