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  • Bandwidth

    The frequency difference between the highest and lowest 
    frequencies involved. 
    The greater the bandwidth of a transmission channel the more 
    information it can carry. In computer connection this is normally 
    measured in bits per second.

  • Backlight

    As the word implies, this is the light source located behind the panel 
    of LCD and AMLCD screens. Light Emitting Diodes [LED], have been 
    developed to increase light and power efficiency. 

  • Bass Bandwidth

    The amount of bandwidth required by a signal not modulated 
    such as video or audio. 
    In general the higher the quality of the signal the greater the 
    base bandwidth required.

  • Bi-level

    A type of image containing only black and white pixels

  • Binary

    Numbering system with only two values: 0 (zero) and 1 (one). 
    Reference normally used in computer based equipment.

  • Bit

    Abbreviation of Binary Digit - This is the smallest unit of 
    information a computer can hold.

  • BNC

    Bayonet Nut Connector - (Sometimes referred to as 
    British Naval Connector or Bayonet Neill Concelman). 
    A type of connector preferred by many professionals to 
    ensure positive and secure connections of cable between 
    equipment's BNC sockets. The basic BNC

  • Black Matrix

    The generic description of a light shielding film that separates 
    the pixels of a screen's colour filter.The use of black matrix is to 
    cover the interval between R, G, B pixel on the colour filter. 

  • Blu-ray Disc

    Blu-ray Disc is a next-generation optical disc format being 
    developed for High-Definition video and high-capacity software 
    applications. A single-layer Blu-ray Disc will hold up to 
    25 gigabytes of data and a double-layer Blu-ray Disc will hold up 
    to 50 gigabytes of data.

  • Borosilicate

    A family of glass compositions in which Boron Trioxide and 
    Silicon Dioxide are major components.

  • BPF

    Band Pass Filter - A circuit, commonly having inductance and 
    capacitance, that effectively passes a given range of frequencies. 
    Those frequencies above and below this range are attenuated.

  • Broadcast

    A transmission of radio or television programmes. 
    Broadcast Quality equipment usually refers to very high quality 
    and efficient commercial equipment used to withstand rigorous 
    use and perform to extremely high standards.

    Different countries have a variety of standards.

  • Beam

    i) The electron stream that generates a picture on the surface 
    of a TV tube; ii) A type of highly directional antenna /aerials, 
    radiating in one general direction but capable of providing high 
    power signal gains.

  • Burn-in

    Burn-in is associated with CRT [Cathode Ray Tube] and Plasma 
    TVs when a static image is semi or permanently displayed on a 
    screen for an extremely long time. 
    This 'burn-in' or image retention was very apparent with CRT long 
    before the days of Plasma and LCD. In the days when computers 
    and screens were being left switched on for 24 hours a day, t days 
    a week and 52 weeks a year in offices, railway stations and airports 
    up and down the country.
    This is why the screensaver was originally developed.
    It is still true that images can 'burn-in' and permanently damage 
    pixels on CRT or Plasma TV should the same images be static for 
    extraordinary long periods of time - this is very unusual in normal 
    domestic usage.

    As you would expect, technology has greatly advanced to assist in the 
    reduction of any remote chance of a burn-in issue with Plasma TV.

    Several manufacturers have developed clever pixel shifting devices 
    and other technologies to minimize any possible damage. Beside the 
    manufacturers reducing 'burn-in' possibilities, a simple way for any 
    Plasma TV user to extend the life of their TV if they are duly concerned, 
    is to ensure correct brightness levels. Please note, in normal viewing 
    conditions, 'burn-in' should not pose any problem with your Plasma TV.

  • Brightness

    Measure of luminosity in a screen, i.e., Part of a picture signal 
    (TV broadcast) that causes a picture receiver's circuitry to vary 
    light intensity from white to black with many shades of grey in 
    Luminance is the physical measure of brightness.

    A standard unit of LUMINANCE is candela per square metre [cd/m2].
    Referred to as Nits in the USA from the latin 'nitere' = 'to shine'.
    Typical LUMINANCE values are:
    ·         600,000 cd/m2 - Solar disk at horizon;
    ·         120,000 cd/m2 - 60w Frosted bulb;
    ·         8,000 cd/m2 - Average Clear Sky;
    ·         2,500 cd/m2 - Moon Surface;
    ·         2,000 cd/m2 - Average Cloudy Sky;
    ·         30 cd/m2 - Green electroluminescent source;
    ·         0.0004 cd/m2 - Darkest Sky.
    Source: SCHORSCH

  • Broadband

    Broadband is an 'on-line' service from a registered Internet Providor [IP] 
    enabling speedier access to the World Wide Web [www] and 
    communication with others via Internet messaging. 
    Having broadband usually provides a faster 'download' and 'upload' 
    speed than normal phone line / cable connection. 
    The speed is measured in megabytes per second [Mb/s] - the higher 
    the number the faster the connection.

    With deregulation of this service, there are many service providers. 
    Though many service providers mention 'Up to 20 Mb/s or more, 
    it is common that 2 Mb/s is the general domestic maximum until 
    fiber optics are more available to a wider population. 
    As with all signals, whether TV, Radio or Mobile, the speed and 
    efficiency of the service is only as good as 'the weakest link'.

    In the case of Broadband, the BT cabling is usually the weakst link, 
    being dated and generally incable of handling the extra vast online 
    use with the increasing numbers of people using the internet.

    BT are gradually introducing fiber optic cabling to provide greater 
    speeds to urban populations. Virgin Cable have the distinct 
    advantage of utilising a non BT fiber optic system laid many years 
    To test your own speed of signal, logon to the FREE service of:

  • Byte or B

    Basic Unit of Memory - Represents the amount of memory 
    (one character of information is usually eight bits wide) needed 
    to specify one letter, number or typographic symbol.