A multiplexer is a device which aggregates transmission channels on a single medium and enables the sharing of these resources for more efficient bandwidth allocation. Almost all video equipment utilizes composite video inputs or outputs. Cable TV, and broadcast TV are sources of composite video that generate composite video outputs. Video devices such as VCRs, video cameras, digital camcorders, and TV monitors receive and convert composite video in recording or playing video data, thereby processing composite video inputs. Multiple video systems use a video multiplexer to control and access the plurality of video signals. A multiplexer provides cost saving benefits by allowing several video devices to share the same display and/or video recording device. A time division multiple access (TDMA) multiplexer for video signals has as its inputs a plurality of video channels and is controlled to output only one channel at a time at an output port.
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