Surveillance Equipment, CCTV cameras, Security Cameras, DVR News.

CCTV Glossary of Terms – Part 1 (A-B)

Below are a few technical terms which are frequently used with CCTV Cameras and products. This is part 1 and will publish few more in the future parts.

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  • AGC – Automatic Gain Control – Electronic Circuit to increase the video signal in low light conditions. This usually introduces noise into the picture and should be Off unless required.
  • Aperture – The light gathering area of a lens, the iris controls the size of the aperture.
  • Aspect Ratio – The ratio of the vertical to the horizontal image size. eg : 3:4
  • Automatic IRIS – A lens that automatically adjusts to allow the correct amount of light to fall on the imaging device. The tiny motor and amplifier built in generally receives a control signal from the camera to maintain a constant one volt peak to peak (PP) video level.
  • Back Focus – A mechanical adjustment in camera that moves the imaging device relative to the lens to compensate for different back focal lengths of lenses. This is very important for a zoom lens fitted camera.
  • Balanced Signal – A video signal converted to a balanced signal, usually to enable it to be transmitted along a twisted pair cable. Used in situations where the cabling distance is too great and which would produce unacceptable losses in coaxial cable.
  • Bandwidth – The amount of space in a given part of a spectrum needed to carry communication signals.
  • Bifurcator – An adapter with which a loose tube containing two optical fibres can be split into two single fibre cables.
  • Black Level – The dark parts of a video signal corresponding to approximately 0.3 volts.
  • Blanking Period – The period of the composite video at black level and below when the retrace occurs, making it invisible on the screen.
  • Buffer – The material surrounding the fibre to protect it from physical damage.
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