Glossary - T

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TBC: Stands for Time Base Correction. TBC is the synchronisation of different signals inside a device such as a multiplexer or TBC Corrector.
TDG: Short for Time and Date Generator.
Telemetry: Remote controlling system of, usually, digital encoded data, intended to control pan, tilt, zoom, focus, preset positions, wash, wipe and similar. Being digital, it is usually sent via twisted pair cable, or coaxial cable together with the video signal.
Termination: This usually refers to the physical act of terminating a cable with a special connector, wihch for coaxial cable is, usually, BNC. For fibre optic cable this is the ST connector. It can also refer to the impedance matching when electrical transmission is in use. This is especially important for high frequency signals, such as the video signal, where the characteristic impedance is accepted to be 75 Ohms.
Time Lapse VCR: A video recorder, most often in VHS format, that can prlong the video recording on a single tape up to 960 hours (this refers to a 180min tape). This type of VCR are very often used in CCTV systems. The principle of operation is very simple - instead of having the video tape travel at a constant speed of 2.275cm/s (which is the case with the domestic models of VHS VCRs), it moves with discrete steps which can be controlled. Time Lapse VCRs have a number ofther special functions very useful in CCTV, usch as an external alarm trigger, time and date superimposed on the video signal, alarm search and so on.
Time lapse video recording: The intermittent recording of video signals at intervals to extend the recording time of the recording medium. It is usually measured in reference to a 3hr (180min) tape.
Time multiplexing: The technique of recording several cameras onto, usually, one time lapse VCR by sequentially sending camera pictures with a timed interval delay to match the time lapse mode selected on the recorder.

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Glossary - T