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| Digital Video Recording |
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Security application of DVRs/NVRs
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.
Security DVRs may be categorized as being either PC based or embedded. A PC based DVR?ÇÖs 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.
Hardware features vary and may include but are not necessarily limited to:
Designed for rack mounting or desktop configurations.
Single or multiple video inputs with connector types consistent with the analog or digital video provided such as coaxial cable, twisted pair or optical fiber cable. The most common number of inputs are 1, 4, 8, 16. Systems may be configured with a very large number of inputs by networking or bussing individual DVRs together.
Controlled outputs to external video display monitors.
Front panel switches and indicators that allow the various features of the machine to be controlled.
Network connections consistent with the network type and utilized to control features of the recorder and to send and/or receive video signals.
Connections to external control devices such as keyboards.
A connection to external pan-tilt-zoom drives that position cameras.
Internal CD, DVD, devices typically for archiving video.
Connections to external storage media.
Alarm event inputs from external security detection devices, usually one per video input.
Alarm event outputs from internal detection features such as motion detection or loss of video. |
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