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101
Glossary
Following is an explanation of some of the terms used in this guide which may
be unfamiliar or which were not explained in the manual itself. Further
information can be obtained by referring to other commercially-available
publications.
5BNC
A port used to input analog video signals.
A/V Mute
The momentary canceling of audio and video output. This projector has an [A/V
Mute] button which you can press to momentarily stop the projection of pictures and
sound. The picture and sound can be restored by pressing the [A/V Mute] button on
the projector’s control panel or the remote control once more.
Aspect ratio
The ratio between an image's length and its height. HDTV images have an aspect ratio
of 16:9 and appear elongated. The aspect ratio for standard images is 4:3.
Color
difference
signal
(component)
A type of video signal output by video equipment which actually consists of three
separate signals: a red + luminance signal (R-Y), a luminance signal (Y) and a blue +
luminance signal (B-Y). Each signal is transmitted along a separate cable. Color
difference signals generally result in a better image than composite signals (in which
the red, green and blue signals and the luminance signal are all transmitted along a
single cable).
Color
temperature
The temperature of an object which is emitting light. If the color temperature is high,
the colors tend to take on a bluish tinge. If the color temperature is lower, the colors
tend to take on a reddish tinge.
Component
video
Video signals which have the video brightness signals and color signals 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 (color difference signals).
Composite
video
Video signals which have the video brightness signals and color signals mixed
together. The type of signals commonly used by household video equipment (NTSC
format).
The signals consist of the carrier signal Y (luminance signal) and the chroma (color)
signal which are contained in the color 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 more clearly, or to make them
appear softer. Adjusting this particular property of an image is called "contrast
adjustment".
Cool-down
The cooling process for the projector's lamp unit continues even after the [Power]
button has been pressed to turn off the lamp. After the lamp turns off, the cooling fan
continues operating, but all button operations are disabled. The length of time that this
is happening is called the "cool-down period". The cool-down period lasts for about 2
minutes. The actual time will vary depending on the external air temperature.
DFP
Abbreviation for Digital Flat Panel. Refers to a standard method for digital
transmission of video signals.
DVI
Abbreviation for Digital Visual Interface. Refers to a standard method for digital
transmission of video signals.
DVI is a standard which has also been applied to digital household electronic
equipment other than computers. It allows images to be transmitted at higher
resolutions than for DFP, and also includes a digital signal encoding function.
Freeze
The momentary pausing of image playback only. When the [Freeze] button on the
projector is pressed, the image playback only can be paused. When the [Freeze] button
is pressed again, playback resumes.
HDTV
An abbreviation for High-Definition Television. It refers to high-definition systems
which satisfy the following conditions.
• Vertical resolution of 720P or 1080i or greater
(P = progressive scanning, i = interlaced scanning)
• Screen aspect ratio of 16:9
• Dolby Digital audio reception and playback (or output)