GLOSSARY
VistaGRAPHX 2500 User's Manual
A-3
A display of help information on the projection screen.
The frequency at which scan lines are generated, which varies amongst sources.
Also called horizontal scan rate or line rate.
A circular area of a screen where the image appears brighter than elsewhere on
the screen. The hot spot always appears along the line of sight and "moves" with
the line of sight. High gain screens and rear screens designed for slide or movie
projection usually have a hot spot.
A physical connection route for a source (input) signal.
Signal sent from a source to the projector.
A device that accepts an input signal for display by the projector.
A method used by video tape players and some computers to double the vertical
resolution without increasing the horizontal line rate. If the resulting frame rate
is too low, the image may flicker depending on the image content.
A small push-button device which allows the user to control projector settings
and operation. There are three different VistaGRAPHX 2500 keypads: built-in,
IR remote, and wired remote (optional). For more information, refer to 3.3,
Using the Keypads.
A distortion of the image which occurs when the top and bottom borders of the
image are of different lengths. Side borders slant in or out, producing a keystone
shaped image.
The reproduction of the horizontal and vertical size of characters and/or shapes
over the entire screen.
When light from a projector is incident on a screen, the light reflects from the
screen such that the angle of reflection equals the angle of incidence. The Line
of Best Viewing is along the line of reflection.
The method of feeding a series of high impedance inputs from a single video
source with a coaxial transmission line in such a manner that the line is
terminated with its characteristic impedance at the last input on the line.
The amount of visible light emitted by a light source is measured in lumens.
The amount of visible light per square meter incident on a surface.
1 lux = 1 lumen/square meter = 0.093 foot-candles
A list of selectable options displayed on the screen.
A video output format of some video tape and disk players. There are two types
of NTSC (National Television Standards Committee) video: NTSC 3.58 and
NTSC 4.43. NTSC 3.58 is used primarily in North America and Japan.
NTSC 4.43 is less commonly used.
Help Screen
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Horizontal Frequency
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Hot Spot
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Input
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Input Signal
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Interface
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Interlace
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Keypad
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Keystone
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Linearity
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Line of Best Viewing
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Loopthrough
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(Loopthru)
Lumen
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Lux
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Menu
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NTSC Video
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Summary of Contents for VistaGRAPHX 2500
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