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  • Carrier

    A high frequency signal used to transport additional signals, which 
    are isolated from one another to reduce interference.

  • CRT

    Cathode Ray Tube - Colour picture tubes used in conventional TV sets. 
    An electron gun at the back of the set generates beams that are guided 
    to the screen, illuminating small red, green and blue phosphor targets 
    on the front surface. This process produces colours and images

  • CATV

    Community Antenna Television (or Cable Television) - Often used in 
    tower blocks or areas of dense housing, this system is used for 
    multi-distribution of satellite and cable channels.

  • CCD

    Charge Coupled Device - Commonly used in camcorders, it is an 
    integrated micro-electrical light sensing device built into image 
    capturing system.

  • CD-ROM

    Compact Disc - Read Only Memory - A storage device that appears 
    similar to an audio CD and store as much data as a large computer 
    Hard Disk (600MB), making it a popular means of distributing 
    marketing or sales messages, photos, multimedia and other still 
    or moving communication.
    As the name indicates, the disc is Read Only and as such no 
    changes can be made to the disc's files.

  • CEBus

    Community Electronic Bus - A domestic automation standard developed 
    by the EIAJ (Electronic Industries Association of Japan) and allied 
    associations representing the appliance, heating, ventilating, 
    air conditioning, security, telecommunications, utilities and cable industries.

  • CGA

    Colour Graphics Adapter - A display system capable of rendering four 
    colours with a maximum resolution of 320 pixels horizontally by 200 
    pixels vertically.

  • Channel

    Common name for a transmission frequency.

  • Chroma Resolution

    The amount of colour detail available in a television system, separate 
    from any brightness detail.

  • Chrominance (Chroma)

    A signal that carries the colour information needed to produce a colour 
    picture; (added to the luminance signal).

  • Chromatics

    The science of colour

  • CIE

    Commission Internationale de l'Eclairage - An organisation that 
    has established a number of widely used colour definitions.

  • Clipping Circuit

    In vision terms this is a circuit that restricts the amplitude of the 
    luminance signal. It converts all tones lighter than a specified 
    grey level to white, or darker than a specified grey level to black, 
    causing loss of detail. This applies also to individual channels 
    in a colour image.

  • CMS

    Colour Management System - Ensuring colour uniformity across 
    input and output devices so that final results match original colours. 
    The characteristics or profiles of these devices are normally 
    established to standard colour targets.

  • Coaxial Cable

    Round antenna (aerial) wire consisting of a central inner conductor 
    and a cylindrical outer conductor. Commonly used for most
    RF (Radio Frequencies above 15KHz) and video connections. 
    Carries both picture and sound for all available channels. 
    75 Ohm* Coaxial is the cable normally used - * see Ohm for full 
    description.

  • Co-Channel Interference

    This type of interference is caused by two or more television 
    broadcast stations utilising the same transmission frequencies.

  • Colour Bars

    Series of vertical coloured stripes - A video test signal generated 
    electronically for use as reference to gauge brightness, contrast, 
    colour intensity and correct colour balance.

  • Colour Fringing

    False colour at the edges of objects - This sometimes causes 
    small objects to appear separated into different colours.

  • Colour Killer

    De-activation of colour circuits for Black & White signals in the 
    absence of colour burst.

  • Colour Purity

    Quality of Screen's / TV's three primary colours (Red, Green & Blue
    either separately or when mixed to produce a Grey Scale.

  • Comb Filter

    Used in conventional TV sets, this electronic device is used to 
    remove undesirable signals whilst improving resolution and 
    reducing colour-related distortion by separating the luminance 
    (brightness) and chrominance (colour) information.

  • Composite Video Signal

    A signal consisting of the video signal (luminance and chrominance), 
    burst signal and sync signal (horizontal and vertical).

  • Contrast

    The range of brightness between the darkest and brightest areas 
    in a picture.

  • Convergence

    Used on conventional colour televisions, circuits are required to 
    align the three scanning electron beams that produce a colour 
    picture. Mis-aligned beams degrade the quality of the picture. 
    This was a common problem in the early 1970's when TV's 
    were working with both transistors and valves.

  • CPS

    Cycles Per Second - See Hertz (Hz).

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