Dell 1201mp Owner's Manual page 69

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Glossary

ANSI Lumens—A standard for measuring light output, used for comparing

projectors.

Aspect Ratio—The most popular aspect ratio is 4:3 (4 by 3). Early television and

computer video formats are in a 4:3 aspect ratio, which means that the width of

the image is 4/3 times the height.

Backlit (Backlight)—Refers to a remote control, or a projector control panel, that

has buttons and controls that are illuminated.

Bandwidth—The number of cycles per second (Hertz) expressing the difference

between the lower and upper limiting frequencies of a frequency band; also, the

width of a band of frequencies.

Brightness—The amount of light emitting from a display or projection display or

projection device. The brightness of projector is measured by ANSI lumens.

Color Temperature—A method of measuring the whiteness of a light source.

Metal halide lamps have a higher temperature compared to halogen or

incandescent lights.

Component Video—A method of delivering quality video in a format that

contains all the components of the original image. These components are referred

to as luma and chroma and are defined as Y'Pb'Pr' for analog component and

Y'Cb'Cr' for digital component. Component video is available on DVD players and

projectors.

Composite Video—The combined picture signal, including vertical and

horizontal blanking and synchronizing signals.

Compression—A function that deletes resolution lines from the image to fit in

the display area.

Compressed SVGA—To project an 800x600 image to a VGA projector, the

original 800x600 signal must be compressed down. The data displays all the

information with only two thirds of the pixels (307,000 vs 480,000). The resulting

image is SVGA page size but sacrifices some of the image quality. If you are using

an SVGA computers, connecting VGA to a VGA projector provide better results.

Compressed SXGA—Found on XGA projectors, compressed SXGA handling

allows these projectors to handle up to 1280x1024 SXGA resolution.

Compressed XGA—Found on SVGA projectors, compressed XGA handling allows

these projectors to handle 1024x768 XGA resolution.

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