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Hughes JVC Projector 230 Sc Service Manual

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    							Glossary
    Model 230 Service Manual B-3
    Luminance
    Abbreviated as Y.  The portion of the signal that
    contains the black and white information, which
    affects brightness.
    Noise
    An undesirable electrical interference of a signal.
    Overscanning
    Displaying less than the complete area of an
    image to a viewer (i.e., scanning beyond the
    visible area).  All TV sets are overscanned at
    least slightly, so that viewers do not see blanking.
    Raster
    The area illuminated by the scan lines on a CRT.
    Resolution
    The degree of sharpness of a displayed or
    printed character or image;  the amount of detail
    in a picture.  On a display screen, resolution is
    expressed as the number of horizontal dots
    (columns) by the number of vertical lines (rows).
    For example, a 680 x 400 resolution means 680
    dots across each of 400 lines.
    Retrace
    The blanked-out line traced by the scanning
    beam of a picture tube as it travels from the end
    of any horizontal line to the beginning of either
    the next horizontal line or field.  The beam is
    turned off during retrace.
    RGB (Red, Green, Blue)
    Refers to the method of recording and generating
    colors in a video system.  On a television or color
    monitor, colors are displayed as varying
    intensities of red, green and blue dots.  When
    red, green and blue are all turned on high, white
    is produced.  When all dots are turned off, the
    base color of the screen appears.
    Rollbar Assembly
    Assembly where the front and rear cover are
    hinged to. Used to hold covers in place.
    S-VHS
    A high band video recording process for VHS that
    increases picture quality and resolution capability.
    S-VHS tape machines use a special output
    terminal which allows separate output of
    luminance (Y) and chrominance (C) picture
    information to monitors equipped with S-Video
    inputs.
    S-Video
    A video signal that has the luminance (Y)
    information separated from chrominance (C)
    information. 
    						
    							Glossary
    B-4 Model 230 Service Manual
    Saturated Color
    1)  A color as far from white, black or gray as it
    can be (i.e., vermilion rather than pink).  2)  A
    display misadjustment that results in unnaturally
    bright colors.
    Scan
    To scan is to move across a picture frame a line
    at a time, either to detect the image, as in an
    analog or digital camera, or to refresh a CRT-
    based video screen.
    Scan Line
    One of many horizontal lines in a graphics frame.
    Scan Rate
    The frequency of line scanning for a monitor or
    projector.
    Synchronization
    Also called sync for short.  Working together.
    At the same time, horizontal and vertical sync
    signals from the signal source control the
    monitors scan circuits to properly time the lines
    and frames of a picture.
    Technician Remote
    Remote control used during Model 230 setup and
    adjustment. Alternative to Standard Remote.
    Provides access to many of the setup functions
    by direct keys instead of by menu maneuvering.
    Throw
    Distance to the screen from the projector.
    Underscan
    Decrease raster size H and V so that all four
    edges of the picture are visible on the display.
    Vertical Height Pots
    Potentiometers located on the Horizontal/Vertical
    Deflection Board. Used to adjust Vertical height.
    Vertical Resolution
    The amount of detail that can be perceived in the
    vertical direction;  the maximum number of
    alternating white and black horizontal lines that
    can be counted from the top of the picture to the
    bottom.
    Vertical Scan Frequency
    The vertical scan frequency of the input signal.
    (V-Freq)
    Vertical Scan
    Reverses the image vertically for use with ceiling
    Reversal Jumper
    displays or mirror-bounced displays. Located on
    the Scan Reversal Board.
    Vertical Synchronization
    The number of times per second a frame is
    Frequency
    transmitted to a video display screen.
    Xenon Arc Lamp
    See Arc Lamp. 
    						
    							Glossary
    Model 230 Service Manual B-5 
    						
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