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Glossary - F

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FCC
The Federal Communications Commission (USA)
Field
A television term which refers to one half of the TV frame, and which is composed of either all odd or even lines. In CCIR systems each field is composed of 625/2=312.5, in EIA systems 525/262.5 lines. There are 50 fields/second in CCIR/PAL, and 60 in the EIA/NTSC TV system.
Fixed focal length lens
A lens with a pre-determined fixed focal length, normally has a focusing control and a choice of iris functions.
Focal Length
The distance between the optical centre of a lens and the principal convergent focus point.
Focusing Control
A means of adjusting the lens to allow objects at various distances from the camera to be sharply defined.
Foot-candela
An illumination light unit used mostly in American CCTV terminology. It equals ten times(more precisely 9.29) of the illumination value in luxes.
Frame store
An electronic device that digitises a TV frame(or TV field) of a video signal and stores it in memory. Multiplexers, fast scan transmitters, Quad compressors and even some of the latest colur cameras have built-in frame stores.
Frame switcher
A frame switcher is another name for a simpler multiplexer, which can record multiple cameras on a single VCR (and play back any camera in full screen), but does not have a "mosaic" image display.
Frame transfer
Refers to one of the three principles of charge transfer in CCD chips. The other two are interline and frame-interline transfer.
Frame
(See also Field). A television term that refers to a composition of lines that make one TV frame. In CCIR/PAL TV system one frame is composed of 625 lines, whilst in EIA/NTSC TV system of 525 lines. There are 25 frames/second in the CCIR/PAL and 30 in the EIA/NTSC TV system.
Frame-interline transfer
Refers to one of the few principles of charge transfer in CCD chips. The other two are interline and frame transfer.

 

 

 

 

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