This section briefly explains the difficult terms that are not explained in the text of this guide. For details, refer to other commercially available publications.
Aspect Ratio
The ratio between an image's length and its height. Screens with a horizontal:vertical ratio of 16:9, such as HDTV screens, are known as wide screens.
SDTV and general computer displays have an aspect ratio of 4:3.
Component Video
A method that separates the video signal into a luminance component (Y), and a blue minus luminance (Cb or Pb) and a red minus luminance (Cr or
Pr).
Composite video
A method that combines the video signal into a luminance component and a color component for transmission down a single cable.
Contrast
The relative brightness of the light and dark areas of an image can be increased or decreased to make text and graphics stand out more clearly, or to
make them appear softer. Adjusting this particular property of an image is called contrast adjustment.
HDTV
An abbreviation for High-Definition Television that refers to high-definition systems which satisfy the following conditions.
• Vertical resolution of 720p or 1080i or greater (p =
Progressive
g
, i = Interlace
g
)
• Screen
aspect ratio
g
of 16:9
Interlace
Transmits information needed to create one screen by sending every other line, starting from the top of the image and working down to the bottom.
Images are more likely to flicker because one frame is displayed every other line.
Progressive
Projects information to create one screen at a time, displaying the image for one frame. Even though the number of scan lines is the same, the amount
of flicker in images decreases because the volume of information has doubled compared with an interlace system.
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 to refresh the light-emitting element. The number of refresh operations per second is called the Refresh Rate and is
expressed in hertz (Hz).
SDTV
An abbreviation for Standard Definition Television that refers to standard television systems which do not satisfy the conditions for HDTV
g
High-
Definition Television.
sRGB
An international standard for color intervals that was formulated so that colors that are reproduced by video equipment can be handled easily by
computer operating systems (OS) and the Internet. If the connected source has an sRGB mode, set both the projector and the connected signal source
to sRGB.
SVGA
A screen size standard with a resolution of 800 (horizontal) x 600 (vertical) dots.
S-Video
A method that separates the video signal into a luminance component (Y) and a color component (C).
SXGA
A screen size standard with a resolution of 1,280 (horizontal) x 1,024 (vertical) dots.
Sync.
The signals output from computers have a specific frequency. If the projector frequency does not match this frequency, the resulting images are not of
a good quality. The process of matching the phases of these signals (the relative position of the crests and the troughs in the signal) is called
Synchronization. If the signals are not synchronized, flickering, blurriness, and horizontal interference occur.
Tracking
The signals output from computers have a specific frequency. If the projector frequency does not match this frequency, the resulting images are not 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 appear in the signal.
Glossary
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