Appendices > Glossary

Refresh Rate

The light-emitting element of a display maintains the

 

same luminosity and colour for an extremely short

 

time. For this reason, 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).

 

 

Resized display

This function is used to project computer images that

 

have a resolution more than or less than the

 

projector's panel resolution, so that they fill the

 

whole of the projection area.

 

 

SDTV

An abbreviation for Standard Definition Television.

 

It refers to standard television systems which do not

 

satisfy the conditions for High-Definition Television.

 

 

Security

A device consisting of a projector case with a hole in

lock

it that a commercially-available theft-prevention

 

cable can be passed through in order to secure the

 

device to a table or pillar. This projector is

 

compatible with the Microsaver Security System

 

manufactured by Kensington.

 

 

Squeeze

The method of compressing 16:9 Widescreen images

mode

and recording them on video software as 4:3 images.

 

When projecting with Squeeze mode on, the images

 

will return to their original 16:9 format.

 

 

sRGB

An international standard for colour intervals that

 

was formulated so that colours which are reproduced

 

by video equipment can be handled easily by

 

computer operating systems (OS) and the Internet.

 

 

 

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SVGA

A type of video signal with a resolution of 800

 

 

 

(horizontal) 600 (vertical) dots which is used by

 

 

 

IBM PC/AT-compatible computers.

 

 

 

 

 

 

S-Video

A type of video signal which has the video

 

 

 

brightness and colour signal information separated,

 

 

 

in order to provide better image quality. It refers to

 

 

 

images which consist of two independent signals:

 

 

 

Y(luminance signal), and C (colour signal).

 

 

 

 

 

 

Sync.

The signals output from computers have a specific

 

 

(Synchronisation)

frequency. Image quality will suffer if the projector

 

 

 

frequency and the computer frequency do not match.

 

The process of matching the phases of these signals

 

 

 

(the relative position of the crests and troughs in the

 

 

 

signal) is called "synchronisation". If the signals are

 

 

 

not synchronised, problems such as flickering,

 

 

 

blurriness and horizontal interference can occur.

 

 

 

 

 

 

Tracking

The signals output from computers have a specific

 

 

 

frequency. Image quality will suffer if the projector

 

 

 

frequency and the computer frequency do not match.

 

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 will appear in the projected

 

 

 

images.

 

 

 

 

 

 

VGA

A type of video signal with a resolution of 640

 

 

 

(horizontal) 480 (vertical) dots which is used by

 

 

 

IBM PC/AT-compatible computers.

 

 

 

 

 

 

XGA

A type of video signal with a resolution of 1,024

 

 

 

(horizontal) 768 (vertical) dots which is used by

 

 

 

IBM PC/AT-compatible computers.

 

 

 

 

 

 

 

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Epson 1EMP-S1 manual Sdtv

1EMP-S1 specifications

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