S/N RATIO
Signal-to-Noise ratio is calculated with the logarithm of the normal signal and the noise RMS value.
SCENE ILLUMINATION
The average light level incident upon a protected area. Normally measured for the visible spectrum with a light meter having a spectral response corresponding closely to that of the human eye and is quoted in lux. Scotopic Vision levels are illumination levels below 10-2 lux, thus invisible to the human eye. Silicon. The raw material of which modern semiconductor devices are made.
SIMPLEX
In general, it refers to a communications system that can transmit information in one direction only. In CCTV, simplex is used to describe a method of multiplexer operation where only one function can be performed at a time, eg. either recording or playback individually.
SKIN EFFECT
The tendency of alternating current to travel only on the surface of a conductor as its frequency increases.
SLOW SCAN
The transmission of a series of frozen images by means of analog or digital signals over limited bandwidth media, usually telephone.
SMEAR
An unwanted side effect of vertical charge transfer in a CCD...
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