63
Appendices
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 aspec t 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 o f 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 vid e o br ig htness signals and color signals separated, in ord er 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 c hr o ma (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.
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.
Dolby Digital A proprietary sound format developed by Dolby Laboratories. Normal stereo is a 2-channel
format that uses two speakers. Dolby Digital is a 6-channel (5.1 channel) format that adds to
this a center speaker, two rear speakers and a sub-woofer.
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 equi pment oth er
than computers. It allows images to be transmitted at higher resolutions than for DFP.
Freeze The momentary pausing of ima ge pl a yback only. When the [Freeze] button 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 750p or 1125i or greater
(p = progressive scanning, i = interlaced scanning )
Screen aspect ratio of 16:9
Dolby Digital au di o reception and playback (or output)
Interlaced
scanning A method of image scanning whereby the signal bandwidth used is approximately ha lf that
required for sequential scanning when images with the same still picture resolution are
broadcast.
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).