Marquee 8521 Ultra Green (HUD) User's Manual
C-2
Glossary
Contrast (ratio)
The ratio of brightness of the brightest possible
area to the darkest possible area of an image.
Convergence
The alignment of the projected red, green and
blue images on the projection screen.
Current Setup Memory
The setup memory which is currently being used
to display a given source's image.
Curved Screen
A projection screen which is curved to improve
screen gain. Curved screens usually have screen
gains which are greater than 1 but viewing angles
much less than 180
E
.
Decoder
A device that converts NTSC, PAL, PAL M, PAL
N, PAL 60, SECAM or NTSC 4.43 video to RGB
video (Marquee Multi-standard Decoder).
Diffused Screen
A type of rear-projection screen which spreads
the light striking it. Screen gain is less than 1 but
audience viewing angles are increased.
Display Setting
The level of a display adjustment. Some display
adjustments are: Contrast, Brightness, Blanking,
Bow, Size, Keystone, Pincushion, Focus and
Convergence.
Flicker
A rapid variation in brightness created when the
frame rate is too slow. (See also Interlace.)
Frame Rate
The frequency at which complete images are
generated. For non-interlaced signals, the frame
rate is identical to the vertical frequency. For
interlaced signals, the frame rate is one half of
vertical frequency.
Foot-candle
The intensity of visible light per square foot.
1 foot-candle = 1 lumen/square foot = 10.76 lux
Foot-lambert
The luminance (brightness) which results from
one foot-candle of illumination falling on a
perfectly diffuse surface.
Gain or Screen Gain
The ability of a screen to direct incident light to an
audience. A flat matte white wall has a gain of
approximately 1. Screens with gain less than 1
attenuate incident light; screens with gain more
than 1 direct more incident light to the audience
but have a narrow viewing angle. For example:
An image reflecting off a 10 gain screen appears
10 times brighter than it would if reflected off a
matte white wall. Curved screens usually have
larger gain than flat screens.
Gamma Correction
A feature provided on Marquee Ultra Series,
9500DM and 8500SM models which boosts the
blue color output when required to provide
improved picture intensity and color uniformity.
Geometry
The reproduction of a straight and rectangular
image.
Help Page
A display of help information on the projection
screen.
Horizontal Frequency
Also called horizontal scan rate or line rate, this is
the frequency at which scan lines are generated.
Horizontal frequencies vary amongst sources.
Hot Spot
A circular area of a screen where the image
appears brighter than elsewhere on the screen.
The hot spot always appears located 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.
Input
A physical connection route for a source signal
defined by two numbers; a switcher number and a
slot number. If the switcher number is 0, the input
is a projector input.
Image Shifter Module
An optional interface module which can lengthen
CRT life while maintaining a bright picture by
slowly shifting the image about the CRT
faceplate. Image shifting occurs both horizontally
and vertically. Shift range is totally controllable by
the user. NOTE: Standard on the 9500LC.
Input Memory
A setup memory which is associated with a
particular projector or switcher input.
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