Bedienungsanleitung Epson EMP-TW200H (Seite 48 von 52) (Englisch)

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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.

Colour temperature

The temperature of an object which is emitting light. If the

colour temperature is high, the colors tend to take on a

bluish tinge. If the colour 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

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 disconnect the

power cable 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 cool-down period lasts for about 5 minutes.

The actual time will vary depending on the external air

temperature.

Gain

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 brighter

ranges separately for R, G and B components.

Gamma

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 intermediate

ranges separately for R, G and B components.

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

, 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

colour television broadcasts. This format is used in Japan,

North America and Central and South America.

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.

PA L

An abbreviation for Phase Alternation by Line, and a

format for ground-based analogue colour 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

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