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VIDEO SURVEILLANCE > Quad/Multiplexer
When more than one camera should be displayed on a single monitor it's necessary to use external devices to manage video inputs. They are of 3 types:
- VIDEO SWITCHERS take several hard-wired video inputs and have a keyboard which enables you to select which camera to view on screen, or shows them all in rotation.
- QUAD SPLITTERS take up to 4 hard-wired video inputs. As well as acting as a video switcher, a quad is used to split the TV or monitor screen into 4 quadrants and view images from 4 cameras simultaneously. The image containing the 4 camera views can also be recorded.
- MULTIPLEXERS perform all the functions of quads and switchers and also enable you to record images from all the cameras simultaneously using a time-lapse cassette video recorder.
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