Display Systems
C-1
Appendix C Glossary
This appendix defines many of the terms used in this manual as they apply to the Marquee projection system.
ACON (Automatic Convergence)
ACON is an optional automatic convergence
feature available for Marquee series projectors.
With ACON installed, convergence of the red,
green and blue images is performed accurately
and automatically with minimal user intervention.
ASI (Automatic Source Interpolation)
A process whereby a display setup for a given
source is approximated from other setups already
in memory. For more information about ASI, refer
to the ASR entry in section 3.7, Utility Features.
ASR (Automatic Source Recall)
A process whereby a display setup for a given
source is chosen from memory according to its
signal parameters (horizontal and vertical
frequencies). For more information about ASR,
refer to the ASR entry in section 3.7, Utility
Features.
Active Line Time
The time, inside one horizontal scan line, during
which video is generated.
Ambient Light Rejection
The ability of a screen to reflect ambient light in a
direction away from the "line of best viewing".
Curved screens usually have good ambient light
rejection. Flat screens usually have less ambient
light rejection.
Analog Video
The video output of most computers and video
tape machines. Analog video can generate a
large number of colors.
Aspect Ratio
The ratio of the width of an image to its height.
Automatic Convergence
The automatic alignment of the projected red,
green and blue images on the projection screen.
Autolock
The ability of the projector to automatically
synchronize to the horizontal and vertical scan
frequencies of an input signal.
Bandwidth
The frequency range of the projector's video amplifier.
Blanking Time
The time inside one scan line during which video
is not generated. The blanking time of the input
signal must be equal to or greater than the
retrace time of the projector.
Bow
A horizontal curve in the center of the image,
and/or a vertical curve across an image.
Brightness
Brightness in projection usually describes the
amount of light emitted from a surface such as a
screen. Brightness is measured in lumens, foot-
lamberts, foot-candles, or lux.
Candela or Candle
The intensity of light is measured in candelas.
Channel
A 2-digit number with user-assigned source input
information. This information includes a physical
input (switcher, slot), a setup memory (input or
recall), and a name or description. Assignments
are made through the Channel List.
Channel List
A list of up to 99 channels (explained above)
which may be created, edited, or deleted by the
user. The Channel List feature provides an
alternative, and sometimes easier, way to select
sources and their setups.
Color Shift
The change in the tint of a white field across an
image.
Color Temperature
This term refers to the coloration (reddish, white,
bluish, etc.) of a white image. (It does not refer to
the brightness of a white image.) The Kelvin (K)
temperature scale is used to measure color
temperature.
Color Temperature Uniformity
The accuracy of color temperature at any
location.
Composite Video
This term refers to the output of video tape
players and some computers. Synchronization,
luminance, and color signals are combined on
one output cable.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
