Epson EMP-30 manual Glossary

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	A method of image scanning whereby the image data from a single image is scanned
scanning	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.

Appendices

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