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  • Negative Guardband

    Refers to a colour picture tube in which holes in the shadow mask are 
    slightly enlarged and phosphor areas slightly reduced. 
    This ensures that each phosphor area is fully illuminated by the electron 
    beam, producing higher brightness.

  • Negative Matrix

    A combination of Negative Guardband and black matrix in a colour tube.

  • NICAM

    Near Instantaneous Companded Audio Multiplex - Method of 
    transmitting stereo TV sound. Used in the UK, Scandinavia, Italy, 
    Hong Kong and Singapore. 
    Left and right channels are converted to a digital signal and 
    transmitted at a rate of 728Kb/sec upon a subcarrier spaced 
    6,552MHz from the vision carrier.

  • Noise

    Used in both audio and vision terms; this is undesirable interference 
    of sound and picture.

  • NTSC

    National Television Standards Committee - Responsible for 
    developing a set of standard protocol for television broadcast 
    transmission and reception in the United States during 1953. 
    Japan adopted the same system where it became in service 
    during 1960.

    Other countries favoured modifications to the NTSC system, 
    PAL and SECAM (see separate entries in glossary). 
    An NTSC TV image has 525 horizontal lines per frame 
    (complete screen image). These lines are scanned from left 
    to right and from top to bottom. 
    Every other line is skipped thus it takes two screen scans 
    to complete a frame: one scan for the odd numbered 
    horizontal lines and another scan for the even numbered lines. 
    Each half-frame screen scan takes approximately 1/60 of second; 
    a complete frame is scanned every 1/30 of a second. 
    This alternate line scanning system is known as interlacing. 
    NTSC signals are not directly compatible with computer systems. 
    Adapters exist that can convert NTSC signals to digital video that 
    a computer can, so called, understand. Conversely there are 
    devices that can convert computer video to NTSC signals allowing 
    a TV receiver to be used as a computer display. 
    However, because a conventional TV receiver has a lower 
    resolution than a typical computer monitor this does not work 
    well for all computer applications, even if the TV screen is very large.

  • Nits

    Often a term used in the USA as a standard unit of Luminance often 
    referred to elsewhere as One Candela per Square Metre [cd/m2]. 
    The term Nits is from the latin 'nitere' = 'to shine'. 
    Luminance is the physical measure of brightness. 
    Luminance is the amount of light leaving a point on a surface in a 
    given direction. 1 Nit = 1 cm/m2.