Runco VX-4C Throw Distance, Variable Scan, Vertical Offset, Video Decoder, Video Standard, YCbCr

GLOSSARY

Throw Distance	The distance between the front feet of the projector and the screen. Also called "Projector-
	to-Screen Distance". Always use the correct throw distance formula to calculate the prop-
	er throw distance (±5%) required for your lens.
Tint	Balance of red-to-green necessary for realistic representation of NTSC signals.
Variable Scan	The ability of a projector to synchronize to inputs with frequencies within a specified
	range.

Vertical Frequency The frequency at which images are generated. Vertical frequencies vary amongst sources.

	Also called vertical scan rate.
Vertical Offset	The difference between the center of the projected image and the center of the projector
	lens. For this projector, this value is expressed as the maximum percentage of the image
	that can be projected above or below the lens center without degrading the image quality.
	Vertical offset ranges depend on the type of lens in use, and whether or not the image is
	offset horizontally at the same time.
Video	The signal that is used by display devices (such as projectors) to generate an image. This
	term also refers to the output of video tape/disk players and computers.
Video Decoder	An optional device that converts NTSC 3.58, NTSC 4.4, PAL, PAL-N, PAL-M or SECAM
	to RGB video.
Video Standard	A specific type of video signal, such as NTSC, PAL, SECAM. This projector can auto-
	matically recognize and interpret the incoming standard and display accordingly.
Viewing Angle	Screens do not reflect equally in all directions. Most light is reflected in a conical volume
	centered around the "line of best viewing". Maximum brightness is perceived if you are
	within the viewing cone defined by the horizontal and vertical viewing angles.
White Balance	The color temperature of white used by the projector.
White Field	The area of an image that is white only. For example, a full white field is an image that is
	white everywhere. A 10% white field is a white area (usually rectangular) that occupies
	10% of the image; the remaining 90% is black.
YCbCr	A high-end digital component video signal.
YPbPr	A high-end analog component video signal. Sometimes called YUV, Component, or Y, R-
	Y, B-Y, the YPbPr signal by-passes the video decoder in this projector.
YUV	See YPbPr.
Zoom	The adjustment of image size by means of a zoom lens.

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