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This sort of system is also called a "closed circuit tv" system, abbreviated CCTV. This enables you to observe a location remotely, without in fact having to be there personally. You will need multiple electronic cameras, each linked to its own monitor. This gets pricey, however, and numerous screens use up space.
This allowed a user to show four, nine, or sixteen cams on a single screen by dividing the screen into equal rows of two, three, or 4 video cameras each. Initially, video was taped using a videocassette recorder, or VCR. VCRs were a step forward for the monitoring industry, however utilizing them properly provided numerous difficulties.
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A basic T-120 VHS tape could only hold about 24 hours of video or so. To extend A Reliable Source out, a workaround needed to be found. What we consider video is simply multiple still images displayed in quick succession, one after another. In North American tv systems, video is specified as a system that displayes thirty photos, or frames, every second.
They could be set to record 15 FPS (frames per second), 7 FPS, 3 FPS, or 1 FPS. Some VCRs could be set to tape-record a single frame every other 2nd! Using time lapse VCRs enabled us to save 960 hours on a single standard T-120 VHS tape. Nevertheless, time lapse recording made it challenging to solve crimes.
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After VCRs, digital video recorders, or DVRs, were introduced. In the security industry, a DVR is a device that digitizes analog video. Converting the video from an analog signal to a digital one gives us much more options not possible with analog, VCR based recording. First of all, tough drives, even small ones, permit considerably longer recording times than VHS tapes.
Third, once a signal is digital, it can be transmitted over the Web. That indicates that any PC with an Internet connection, anywhere in the world, becomes a seeing station, which you're never out of touch no matter how far away you go. Ultimately, a type of DVR called the pentaplex DVR was developed.