Marquee 8521 Ultra Green (HUD) User's Manual
C-4
Glossary
Presentation Level
The projector is at presentation level when an
image is (or may be) displayed and no control,
dialog, error, or help messages are displayed.
For example, if a help page is displayed, the
projector is not at presentation level.
Projector-to-Screen Distance
Also called "Throw Distance", the distance
between the front of the projector's green lens
and the screen.
Protocol
The type of code format utilized by IR keypad(s).
The standard code is Protocol A. By using two
different protocols, two projectors may be used
side by side while being controlled independently
by their remote IR keypads.
Rear Screen
A translucent panel for screen projection.
Incident light travels through the incident surface
of a rear screen and forms an image on the other
surface.
Recall Memory
A setup memory which is not associated with any
particular input.
Resolution - CRT
The maximum number of lines that can be
distinguished on the face of a CRT.
Resolution -Lens
The maximum number of alternate white and
black horizontal lines that can be distinguished on
a screen when a photographic target is placed
between the lens and a light source, and
illuminated by that light source.
Resolution - Projector
The smaller of CRT and Lens resolutions.
Retrace Time (Horizontal)
The minimum time required for the projector to
move the position of the scanning spot from the
right edge to the left edge of a CRT.
Rise Time
The time required by the video amplifier of the
projector to increase its output from 10% to 90%
of the maximum value.
RGB Video
The video output of most computers. It can be
analog or digital. Analog RGB video has 3, 4, or
5 wires; one for red, one for green, one for blue,
and none, one or two for sync. For three wire
RGB, the green wire usually provides sync. (See
also TTL Video).
Scan Frequency
The horizontal or vertical frequency at which
images are generated.
Scan Line
One scan line is one horizontal line on the
display.
SECAM
A video output format of some video tape and
disk players (used primarily in France). SECAM
(Sequential Couleur á Mémoire) signals are
similar in resolution and frequency to PAL signals.
The primary difference between the two
standards is in the way color information is
encoded.
Setup Memory
A projector memory which stores user-adjustable
display settings. There are two types of setup
memories: Input and Recall. Both memory types
store the same parameters. The only difference
is that Input memories store display settings for a
particular physical input (i.e., switcher 0, slot 1)
and Recall memories can be used with any input.
Slidebar
A slidebar is a graphical display of an adjustment
setting. The setting is displayed on a percentage
scale.
Source
A device, such as a computer or VCR, which may
be connected to the projector for display.
Spot Size
The diameter of the smallest dot that can be
generated on the face of a CRT.
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