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Appendix

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.

Aspect

The ratio between an image's length and its height.

HDTV

images have an aspect of 16:9 and appear

elongated. The aspect for standard images is 4:3.

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

, PAL and SECAM formats).

Video signals which consist of a carrier signal Y

(luminance signal) within the color bar signal, and a

chroma or color signal (CbCr).

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

This is the process by which the projector's lamp is

cooled down after it has become hot through use. It is

carried out automatically when the [Power] button on

either the remote control or the projector's control panel

has been pressed to turn off the projector. Do not turn off

the main power switch while cool-down is in progress,

otherwise the cool-down process will not work properly.

If the cool-down period is not allowed to finish normally,

the projector's lamp and internal components will remain

at high temperatures, and this may shorten the useful life

of the lamp or cause problems with the operation of the

projector. The projector takes about 16 seconds to cool

down. The actual time will vary depending on the

external air temperature.

HDMI

An abbreviation for High Definition Multimedia

Interface, and refers to a standard for digital transmission

of high-definition images and multi-channel audio

signals.

HDMI is a standard that is targeted towards household

digital equipment and computers that allows digital

signals to be transmitted in their original high quality

without compression, and it also includes a digital signal

encryption function.

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

, i = interlaced )

• Screen aspect

of 16:9

• Dolby Digital audio reception and playback (or output)

Interlace

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.

NTSC

An abbreviation for National Television Standards

Committee, and a format for ground-based analogue

color television broadcasts. This format is used in Japan,

North America and Central and South America.

PA L

An abbreviation for Phase Alternation by Line, and a

format for ground-based analogue color television

broadcasts. This format is used in Western European

countries except France, and also in Asian countries such

as China and in Africa.

Progressive

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

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 HDTV.

SECAM

An abbreviation for Sequential Couleur A Memoire, and

a format for ground-based analogue color television

broadcasts. This format is used in France, Eastern Europe

and the former Soviet Union, the Middle East and Africa.

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