Christie Digital Systems CSP70 Interface, Interlace, Keypad, Lamp Flicker, Linearity, Loopthrough

Appendix A: Glossary

Interface	' A device, such as the Serial Digital Input Module, that accepts an input signal for
	display by the projector.
Interlace	' 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.
Keypad	' A small push-button device for controlling most projector settings and operation. For
	more information, refer to 3.3, Using the Keypad.
Keystone	' 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.
Lamp Flicker	' As the lamp ages, the shape of two anodes may changes from two points to a flattened
	state. When this occurs, the arc jumps across the gap from varying points. This is seen
	as image flicker. Turning the Lamp Conditioning feature ON will pulse the lamp and
	gradually “condition” the two anodes back to two points. Lamp Conditioning may
	take seconds, minutes or hours to reach full effectiveness. NOTE: Lamp flicker can
	occur at any time in the lamps life. The length of time, over which flicker may occur
	varies considerably and unpredictably. This behavior is inherent in UHP lamps.
Linearity	' The reproduction of the horizontal and vertical size of characters and/or shapes over
	the entire screen.
Line of Best Viewing	' 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.
LiteLOC ' 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.
Loopthrough	' The method of feeding a series of high impedance inputs from a single video source
(Loopthru)	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.
Lumen ' The unit of measure for the amount of visible light emitted by a light source.
Luminance	' 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.
Lux	' The amount of visible light per square meter incident on a surface.
	1 lux = 1 lumen/square meter = 0.093 foot-candles

Menu ' A list of selectable options displayed on the screen.

A-4 RPMSP & CSP70-D100U User’s Manual