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Glossary
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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 scanning
, i = interlaced scanning )
•
••
•
Screen aspect ratio of 16:9
•
••
•
Dolby Digital audio reception and playback (or output)
Interlaced
scanning
A method of image scanning whereby the signal bandwidth used is approximately half that
required for sequential scanning when images with the same still picture resolution are
broadcast.
Offset The adjustment of minute changes in color that occur as result of factors such as differences
in the equipment used to display images. It adjusts the coloration in darker ranges
separately for R, G and B components.
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.
Refresh Rate The light-emitting element of a display maintains the same luminosity and color for an
extremely short time. Because of this, the image must be scanned many times per second in
order to refresh the light emitting element. The number of refresh operations per second is
called the "refresh rate", and is expressed in hertz (Hz).
S-Video images A video signal which has the luminance component and color component separated in
order to provide better image quality.
It refers to images which consist of two independent signals: Y (luminance signal), and C
(color signal).
SDTV An abbreviation for Standard Definition Television. It refers to standard television systems
which do not satisfy the conditions for High-Definition Television.
Security lock A device consisting of a protector case with a hole in it that a commercially-available theft-
prevention cable can be passed through in order to secure the device to a table or pillar. This
projector is compatible with the Microsaver Security System manufactured by Kensington.
sRGB An international standard for color intervals that was formulated so that colors which are
reproduced by video equipment can be handled easily by computer operating systems (OS)
and the Internet.
SVGA A type of image signal with a resolution of 800 (horizontal) x 600 (vertical) dots which is
used by IBM PC/ AT-compatible computers.
SXGA A type of image signal with a resolution of 1280 (horizontal) x 1024 (vertical) dots which
is used by IBM PC/ AT-compatible computers.
Synchronization
(Sync.)
The signals output from computers have a specific frequency. If the projector frequency
does not match this frequency, the resulting images will not be of a good quality. The
process of matching the phases of these signals (the relative position of the crests and
troughs in the signal) is called "synchronization". If the signals are not synchronized,
problems such as flickering, blurriness and horizontal interference can occur.
Tracking The signals output from computers have a specific frequency. If the projector frequency
does not match this frequency, the resulting images will not be of a good quality. The
process of matching the frequency of these signals (the number of crests in the signal) is
called "tracking". If tracking is not carried out correctly, wide vertical stripes will appear in
the projected images.
Three-
dimensional Y/C
separation
A term given to the reduction in fine image distortion such as stripiness and jaggedness of
image contours that can occur as a result of separate digital processing of Y (luminance)
and C (chroma) components of image signals.
UXGA A type of image signal with a resolution of 1600 (horizontal) x 1200 (vertical) dots which
is used by IBM PC/ AT-compatible computers.
VGA A type of image signal with a resolution of 640 (horizontal) x 480 (vertical) dots which is
used by IBM PC/ AT-compatible computers.
XGA A type of image signal with a resolution of 1,024 (horizontal) x 768 (vertical) dots which is
used by IBM PC/ AT-compatible computers.
YCbCr The carrier signal which is contained in the color bar signal used in modern TV
transmissions. The name comes from the Y (luminance) signal and the CbCr (chroma
[color]) signals.
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