Alarming
Feature on some CCTV equipment which allows the equipment to provide a simple switch closure (usually) in response to a designated input alarm signal.
Aperture Opening (Lens)
Controls the amount of light reaching the surface of the camera pick-up device. Aperture size is controlled by the iris. Increasing the f-stop decreases the amount of light reaching the pick-up device.
Aspect Ratio
Ratio of picture height to picture width. Standard ratio is 4:3.
Attenuation
A decrease in signal strength.
Auto Iris Lens
Camera lens which automatically adjust for proper light levels
Auto Pan
Automatic back and forth camera motion
Auto Scan
Same as Auto Pan
Automatic Brightness Control
Electronic circuitry which automatically controls the brightness of video monitors in relation to ambient light.
Automatic Frequency Control (AFC)
Circuitry that automatically maintains the desired frequency.
Automatic Gain Control (AGC)
Circuitry that automatically adjust the signal to proper strength.
Automatic Light Control
Process by which the brightness upon the camera pick-up device is automatically adjusted according to the brightness of the scene.
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