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Glossary 151
Maximum Distance — The distance from a screen the projector can be to
cast an image that is usable (bright enough) in a fully darkened room.
Maximum Image Size — The largest image a projector can throw in a
darkened room. This is usually limited by focal range of the optics.
Minimum Distance — The closest position that a projector can focus an
image onto a screen.
NTSC — National Television Standards Committee. North American
standard for video and broadcasting, with a video format of 525 lines at 30
frames per second.
PAL — Phase Alternating Line. A European broadcast standard for video
and broadcasting, with a video format of 625 lines at 25 frames per second.
Reverse Image — Feature that allows you to flip the image horizontally.
When used in a normal forward projection environment text, graphics, etc.
are backwards. Reverse image is used for rear projection.
RGB — Red, Green, Blue — typically used to describe a monitor that
requires separate signals for each of the three colors.
SECAM — A French and international broadcast standard for video and
broadcasting, closely related to PAL but with a different method of sending
color information.
SSID — Service Set Identifiers — A name used to identify the particular
wireless LAN to which a user wants to connect.
SVGA — Super Video Graphics Array — 800 x 600 pixels count.
SXGA — Super Extended Graphics Array, — 1280 x 1024 pixels count.
UXGA — Ultra Extended Graphics Array — 1600 x 1200 pixels count.
VGA — Video Graphics Array — 640 x 480 pixels count.
WEP — Wired Equivalent Privacy — This is a method for encrypting
communication data. The encryption key is created and notified only to the
communicating user, so the communication data cannot be decrypted by
a third party.
XGA — Extended Video Graphics Array — 1024 x 768 pixels count.
WXGA — Wide Extended Graphics Array — 1280 x 800 pixels count.