Glossary
Acceptance angle Horizontal angle of view of a camera lens.
AGC See Automatic gain control.
Ambient General background noise level or basic illumination.
Amp (A) Ampere, unit of electrical current.
Amplitude modulation A method of transmitting information, by changing the amplitude (strength) of a high-frequency (carrier) wave in proportion to the amplitude of the lower-frequency signal we wish to transmit. The amplitude-modulated carrier is subsequently detected (demodulated) and the original lower-frequency signal recovered.
Analogue An electrical signal that is proportional to the originating source, usually pictures, sound or control signals.
Arc A largely obsolete powerful carbon-fed lamp.
Aspect ratio The ratio between the ...
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