Glossary of Terms
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Data Video Projector
User Manual
Glossary of Terms
Hz, KHz, MHz (Hertz, Kilohertz, Megahertz)
Hertz is a unit of measurement used to express the frequency, in cycles per
second, of an electrical signal or event. (Megahertz = 1 million cycles per
second)
Lumens
A measure of light output on a screen or other surface. One lumen is the light
of one candle power on each square foot of a surface of a sphere at a radius
of one foot from the light soruce.
Metal halide lamp
A modified mercury arc lamp that is extremely bright. It is filled with a gas
with elements known as halogens. The properties of this fill gas allows the
lamp to burn longer and brighter than ordinary lamps.
NTSC (National Television Systems Committee)
Standard for television signals and other video equipment signals. The
standard uses interlaced scans and 525 horizontal lines per frame, at a rate
of 30 frames per second.
PAL (Phase Alternate Line)
The format for colour television signals used in Germany, England and many
other countries. PAL is an interlaced format with 25 frames per second and
625 lines per screen.
Pixel (word coined from Picture Element)
This is one image dot, a definite position on a display that consists of a single
dot or a group of three dots (red, green, blue).
Resolution
The number of pixels available in a display device for creating images.
Expressed as a number of columns by number of rows (e.g. SVGA
resolution, 800 x600).
S-VHS (S-Video, Super VHS)
A video signal which separates the luminance (Y) and chrominance (C)
signals. Also known as Y/C video.
SECAM (Séquentiel Couleur a Mémoire)
A colour television standard developed in France and also used in certain
other countries.
XGA
A standard PC computer analogue interface: resolution of 1024 x 768.