Menu, Ntsc Video, Optical Screen, PAL Video, Protocol

Menu	A list of selectable options displayed on the screen.
NTSC Video	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.
Optical Screen	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.
PAL Video	PAL (Phase Alternating Line) video is a 50 Hz standard with 768 x 576 resolution.
	It is found on some video tape and disk players (used primarily in Europe, China
	and some South American and African countries).
Pincushion	A distortion of the image shape characterized by concave or convex borders.
Pixel (picture element)	The smallest discernible element of data from a computer-generated image.
Pixel Phase	The phase of the pixel sampling clock relative to incoming data.
Pixel Tracking	The frequency of the pixel sampling clock, indicated by the number of pixels per
	line.

Projector-to-Screen Distance

The distance between the projector's front feet centers and the screen. Also called "Throw Distance".

Protocol	The type of code format called "A" or "B" utilized by the remote keypad(s). The
	default protocol set at manufacture is Protocol "A". By using two different keypad
	protocols, adjacent projectors can be controlled independently with their remote
	IR keypads.
Pull-down List	A selectable menu item that unfolds into a list of options pertaining to it.
Rear Screen	A translucent panel for screen projection. Incident light travels through the inci-
	dent surface of a rear screen and forms an image on the other surface.
Resizing	The ability to manipulate through software commands the physical size, placement
	and/or aspect ratio of an image.
Resolution (lens)	The maximum number of alternate white and black horizontal lines that can be dis-
	tinguished on a screen when a photographic target is placed between the lens and
	a light source and illuminated by that source.
Resolution (projector)	The maximum number of pixels that the projector can display horizontally and
	vertically across an image, such as 1280 x 1024.
Retrace Time	(Horizontal) The minimum time required for a CRT projector to move the position
	of the scanning spot from the right edge to the left edge.
Rise Time	The time required by the video amplifier of the projector to increase its output
	from 10% to 90% of the maximum value.
	A-4