Christie roadie 25k User Manual page 158

GLOSSARY
Dot Clock
E-EDID
Foot-candle
Footlambert
Frame Rate
Gain or Screen Gain
HDCP
Horizontal Frequency
Horizontal Offset
A-4
Roadie 25K User's Manual
additional pixels are created by averaging together adjacent pixels in the original
smaller image.
'
The maximum frequency of the pixel clock. Also known as pixel clock rate.
'
The Enhanced Extended Display Identification Data standard, established by VESA,
enables properties (such as resolution) of a display device to be detected by the
display card in a controlling device such as a PC. The PC, in turn, can then output in
a matching format to fill the display. Some sources used with the projector are VESA
E-EDID reported.
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The intensity of visible light per square foot.
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The luminance (brightness) which results from one foot-candle of illumination falling
on a perfectly diffuse surface. 1 fL = 3.423 candela per square meter (cd/m
that SMPTE RP 98 calls for theatre screen luminance of 12 to 22 fL; 16 +/- 2 fL (55
2
+/- 7 cd/m
applications, xenon lamp wattage is approximated to achieve this level using 12 W/ft
x (screen height squared) or 5 W/ft
typical lenses.
'
The frequency at which complete images are generated. For non-interlaced signals,
the frame rate is identical to the vertical frequency. For interlaced signals, the frame
rate (also known as field rate) is one half of vertical frequency.
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The ability of a screen to direct incident light to an audience. A flat matte white wall
has a gain of approximately 1. Screens with gain less than 1 attenuate incident light;
screens with gain more than 1 direct more incident light to the audience but have a
narrow viewing angle. For example: An image reflecting off a 10 gain screen appears
10 times brighter than it would if reflected off a matte white wall. Curved screens
usually have larger gain than flat screens.
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GPIO General Purpose Input Output, used for remote control of a limited number of
programmable functions by direct signal or dry-contact connection.
'
Grass Valley Group (formerly part of Tektronix). More specifically, the .gvg file
GVG
format used for compressed video, audio, and timecode stream transfer in the Profile
video server products, proposed for standardization by SMPTE and as a primary
component of MXF. Initially implemented on Fibre Channel using FTP with TCP/IP
but extensible to XTP or other protocols. Previously called GXF: General Exchange
Format.
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High-bandwidth Digital Content Protection protocol of keys and encryption helps
prevent DVI source material from being copied.
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HDTV High-definition Television (1035, 1080 and 1125 lines interlace, and 720 and 1080
line progressive formats with a 16:9 (i.e. 1.77) aspect ratio.
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The frequency at which scan lines are generated, which varies amongst sources. Also
called horizontal scan rate or line rate.
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The difference between the center of the projected image and the center of the
projector lens. For clarity, offset is often expressed as the maximum percentage of the
) is the open gate target according to SMPTE 196M. For cinema
2
of total 'scope image area, for matte screens and
2
). Note
2