Runco Video Xtreme VX-40d Owner's Operating Manual page 104

Appendix A: Glossary
Line of Best Viewing
Loopthrough (Loopthru)
Lumen
Luminance
Lux
Menu
NTSC Video
Optical Screen
PAL Video
Pixel
Pixel Phase
Pixel Tracking
Projector-to-Screen
Distance
Protocol
Pull-down List
Rear Screen
Resizing
Resolution (lens)
Resolution (projector)
Retrace Time
(Horizontal)
Rise Time
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 unit of measure for the amount of visible light emitted by a light source.
➤
The signal representing the measurable intensity (comparable to brightness) of an
➤
electronic image when the image is represented as separate chrominance and luminance.
Luminance also expresses the light intensity of a diffuse source as a function of its area;
measured in lumens or candles per square foot (1 lumen per square foot = 1 foot-lambert).
SMPTE RP 98 calls for a luminance of 12 to 22 foot-lamberts for theatre screens. See:
Foot-lambert.
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.
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 (Phase Alternating Line) video is a 50 Hz standard with 768 x 576 resolution. It is
➤
found on some video tape and disk players (used primarily in Europe, China and some
South American and African countries).
The smallest discernible element of data from a computer-generated image.
➤
The phase of the pixel sampling clock relative to incoming data.
➤
The frequency of the pixel sampling clock, indicated by the number of pixels per line.
➤
The distance between the projector's lens and the screen. Also called "Throw Distance".
➤
The syntax used by the communication system.
➤
A selectable menu item that unfolds into a list of options pertaining to it.
➤
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.
The ability to manipulate through software commands the physical size, placement and/or
➤
aspect ratio of an image.
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.
The maximum number of pixels that the projector can display horizontally and vertically
➤
across an image, such as 1024 x 768 (called XGA).
The minimum time required for a CRT projector to move the position of the scanning spot
➤
from the right edge to the left edge.
The time required by the video amplifier of the projector to increase its output from 10% to
➤
90% of the maximum value.
Runco VX-40d/-50d/-60d/-80d Owner's Operating Manual
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Appendix A: Glossary