Christie Roadie 25K, User Manual

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GLOSSARY
Roadie 25K User’s Manual
A-5
image that can be projected to one side of the lens center without degrading the
image quality.
A circular area of a screen where the image appears brighter than elsewhere on the
screen. A hot spot appears along the line of sight and "moves" with the line of sight.
High gain screens and rear screens designed for slide or traditional movie projection
usually have a hot spot.
A physical connection route for a source signal, described by a 2-digit number
representing 1) its switcher/projector location and 2) its slot in the switcher/projector.
In this projector, sources connected at a switcher must be selected at the switcher
rather than the projector.
Signal sent from a source device to the projector.
A device, such as the Dual SD/HD-SDI Module, that accepts an input signal for
display by the projector.
A method used by video tape players and some computers to double the vertical
resolution without increasing the horizontal line rate. If the resulting frame/field rate
is too low, the image may flicker depending on the image content.
A distortion of the image which occurs when the top and bottom borders of the image
are unequal in length. Side borders both incline in or out, producing a “keyhole”
shaped image. It is caused when the lens surface is not parallel to the screen.
A Christie software feature where internal samples of light in a projector guide the
precise position of the lamp along 3 axes—vertical, horizontal and distance to lens—
so that lamp performance and output is maximized. Not available in all models.
The reproduction of the horizontal and vertical size of characters and/or shapes over
the entire screen.
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.
A Christie software feature where samples of output light from a projector trigger
automatic adjustments in the lamp ballast power in order to maintain a constant light
output over time. Also known as brightness tracking. Not available in all models.
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. Rarely
used in cinema applications, but common in most other projection applications.
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 footlambert). SMPTE RP 98 calls for a luminance of 12 to 22
footlamberts for theatre screens. See: Footlambert.
Hot Spot
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Input
'
Input Signal
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Interface Module
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Interlace
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Keystone
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LampLOC

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Linearity
'
Line of Best Viewing
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LiteLOC

'
Loopthrough
'
(Loopthru)
Lumen
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Luminance
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