Runco VX-4c - Manual (Page 105)

GLOSSARY
A-6
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 FrequencyThe 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.