GLOSSARY
NTSC Video
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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.
Optical Screen
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A type of rear-projection screen which re-directs light through the screen to increase
image brightness in front of the screen. Screen gain is usually greater than 1 but audience
viewing angles are reduced.
PAL Video
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A video output format of some videotape and disk players (used primarily in Europe,
China and some South American and African countries). All PAL (Phase Alternating
Line) video is a 50 Hz standard with 768 x 576 resolution.
Pincushion
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A distortion of the image, which occurs when the borders are concave or convex.
Pixel (PictureElement)
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The smallest discernable element of a computer generated image.
Presentation Level
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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
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Also called ''Throw Distance'', the distance between the front of the projector's
Distance
green lens and the screen.
Protocol
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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
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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
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A setup memory which is not associated with any particular input.
Resolution of the
CRT
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The maximum number of lines that can be distinguished on the face of a CRT.
Resolution of the
Lens
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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 of the
Projector
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The smaller of CRT and Lens resolutions.
Retrace Time
(Horizontal)
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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
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The time required by the video amplifier of the projector to increase its output from 10%
to 90% of the maximum value.
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Summary of Contents for Model 8
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Page 44: ...INSTALLATION SETUP Figure 2 29 ACON Installation Examples 2 38 ...
Page 104: ...Physical Dimensions 5 5 ...
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Page 113: ...A p p e n d i x B B 1 ...
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