Epson EMP-30, User Manual

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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 text of this guide itself. Further information can be obtained by referring to other
commercially-available publications.
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.
Colour temperature
The temperature of an object which is emitting light. If the colour temperature is high,
the colours tend to take on a bluish tinge. If the colour temperature is lower, the colours
tend to take on a reddish tinge.
Component video Video signals which have the video brightness signals and colour 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 (colour difference signals).
Composite video Video signals which have the video brightness signals and colour signals mixed together.
The type of signals commonly used by household video equipment (NTSC, PAL and
SECAM formats).
The carrier signal Y (luminance signal) and chroma (colour) signal which are contained
in the colour bar are overlapped to form a single 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
on the projector's control panel or the remote control 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 20 seconds. The actual time will vary
depending on the external air temperature.
Dolby Digital A sound format developed by Dolby Laboratories. Normal stereo is a 2-channel format
which uses two speakers. Dolby Digital is a 6-channel (5.1-channel) system which adds
to this a centre speaker, two rear speakers and a sub-woofer.
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 audio reception and playback (or output)
Interlaced scanning A method of image scanning whereby the image data is divided into fine horizontal lines
which are displayed in sequence starting from left to right and then from the top to the
bottom of the screen. The even-numbered lines and odd-numbered lines are displayed
alternately.
Progressive
scanning
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 colour 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).
Resize display This function is use to project computer images that have a resolution or more than or
less than the projector's panel resolution to be projected 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 lock A device consisting of a projector case with a hole in 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.