A-4
GLOSSARY
Menu
!
A list of selectable options displayed on the screen.
NTSC Video
!
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
!
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
!
PAL (Phase Alternating Line) video is a 50 Hz standard with 768 x 576 resolu-
tion. It is found on some video tape and disk players (used primarily in Europe,
China and some South American and African countries).
Pincushion
!
A distortion of the image shape characterized by concave or convex borders.
Pixel (picture element)
!
The smallest discernible element of data from a computer-generated image.
Pixel Phase
!
The phase of the pixel sampling clock relative to incoming data.
Pixel Tracking
!
The frequency of the pixel sampling clock, indicated by the number of pixels per
line.
Projector-to-Screen Distance
!
The distance between the projector's front feet centers and the screen. Also
called "Throw Distance".
Protocol
!
The type of code format called "A" or "B" utilized by the remote keypad(s). The
default protocol set at manufacture is Protocol "A". By using two different key-
pad protocols, adjacent projectors can be controlled independently with their
remote IR keypads.
Pull-down List
!
A selectable menu item that unfolds into a list of options pertaining to it.
Rear Screen
!
A translucent panel for screen projection. Incident light travels through the inci-
dent surface of a rear screen and forms an image on the other surface.
Resizing
!
The ability to manipulate through software commands the physical size, place-
ment and/or aspect ratio of an image.
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 source.
Resolution (projector)
!
The maximum number of pixels that the projector can display horizontally and
vertically across an image, such as 1024 x 768 (called XGA).
Retrace Time
!
(Horizontal) The minimum time required for a CRT projector to move the posi-
tion of the scanning spot from the right edge to the left edge.
Rise Time
!
The time required by the video amplifier of the projector to increase its output
from 10% to 90% of the maximum value.
Summary of Contents for Reflection VX-3C
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Page 119: ...B 1 KEYPAD REFERENCE Figure B 1 Keypad Appendix B ...
Page 120: ...C 1 Menu Tree Appendix C ...
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Page 125: ...D 4 THROW DISTANCE ...
Page 126: ...D 5 THROW DISTANCE ...
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