Christie DS+60 User Manual page 106

Appendix A: Glossary
Input
Input Signal
Interface
Interlace
Keypad
Keystone
Linearity
Line of Best Viewing
Loopthrough
(Loopthru)
Lumen
Luminance
Lux
Menu
NTSC Video
Optical Aperture
Optical Screen
A-4 Christie DS+60 User's Manual
'
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.
'
Signal sent from a source device to the projector.
'
A device, such as the Serial Digital Input 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 small push-button device for controlling most projector settings and operation. For
more information, refer to 3.3, Using the Keypad.
'
A distortion of the image which occurs when the top and bottom borders of the image
are unequal in length. Side borders both slant in or out, producing a "keyhole" shaped
image. It is caused when the screen and lens surface are not parallel, or (in "X"
models) by poor Keystone adjustment.
'
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.
'
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 footlambert). SMPTE RP 98 calls for a luminance of 12 to 22
footlamberts 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.
'
Commonly called an iris, the optical aperture when adjusted affects true contrast.
'
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.