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Glossary
Complex terms used in this book, or terms not explained in the body of
the text, will be briefly explained here. For further explanation, please
consult commercially available reference texts.
5BNC A type of connector used to input analog video
signals.
Aspect ratio The ratio between an image's length and its height.
Images which have an aspect ratio of 16:9 are called
Widescreen. The aspect ratio for standard images is
4:3.
Color
Temperature
The temperature of an object which is emitting light.
When the colour temperature is high, colours tend to
take on a bluish tinge; when the colour temperature
is low, colours tend to take on a reddish tinge.
Component
Video
A type of video signal which has the video
brightness and colour signal information separated,
in order to provide better image quality. In high-
definition TV (HDTV), it refers to images which
consist of three independent signals: Y (luminance
signal), and Pb and Pr (colour difference signals).
Composite Video The standard home video signal (NTSC, PAL,
SECAM) which has the video brightness and colour
signal information mixed together. Composite video
consists of the carrier signal Y (luminance signal)
and the chroma (colour) signal, combined within the
colour bar signal.
Contrast The relative brightness of the light and dark areas of
an image can be increased or decreased in order to
make text and graphics stand out, or appear softer.
Adjusting this particular property of an image is
called "contrast adjustment".
Cool-down The process used to cool down a projector lamp that
is hot from use. Cool-down happens automatically
when the [Power] button is pressed on the projector
or on the remote control to turn the projector off. Do
not unplug the projector power cable whilst it is
cooling down. If cool-down is interrupted, heat from
the lamp gets trapped inside the projector, potentially
shortening the life of the lamp and causing projector
failure.
Dolby
digital
An audio format developed by Dolby Laboratories.
Normal stereo is a 2-channel format which uses two
speakers, whereas Dolby Digital is a 6-channel (5.1-
channel) system which adds a centre speaker, two
rear speakers and a sub-woofer.
HDTV An abbreviation for High-Definition Television, it
refers to high definition systems which satisfy the
following conditions.
• Vertical resolution of 750p or 1125i or greater
(p=Progressive scanningg, i=Interlaced scanningg)
• Screen aspect ratio of 16:9
• Dolby digitalgl audio reception and playback (or
output)
Interlaced
scanning
Each screen is divided into fine horizontal lines
which are displayed in sequence starting from left to
right and then from top to bottom. This method of
image scanning, whereby even numbered lines and
odd numbered lines are displayed alternately, is
called Interlaced scanning.
Progressive
scanning
A method of image scanning whereby the image data
from a single image is scanned sequentially from top
to bottom to create a single image.