Glossary - Epson EMP-1815 User Manual

Glossary

This section explains easily terms that are used with the projector and difficult terms that are not explained in the text of this guide. For details,
refer to other commercially available publications.
Aspect ratio
Component video
Composite video
Contrast
DHCP
Dolby Digital
ESSID
Gateway address
HDTV
Interlace
IP address
Progressive
Refresh rate
SDTV
SNMP
SNMP Trap IP address
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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.
A video signal which has the luminance component and colour component separated to provide better image quality.
Refers to images that consist of three independent signals: Y (luminance signal), Pb and Pr (colour difference signals).
Video signals that 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 that are
contained in the colour bar are overlapped to form a single signal.
The relative brightness of the light and dark areas of an image can be increased or decreased 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".
An abbreviation of Dynamic Host Configuration Protocol, this protocol automatically assigns an IP address
a network.
A sound format developed by Dolby Laboratories. Normal stereo is a 2-channel format that 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.
ESS is an abbreviation of Extended Service Set (enhanced service set). ESSID is an identification number for connecting with a
counterpart on a wireless LAN. Wireless communication is possible between devices that correspond to ESSID.
This is a server (router) for communicating across a network (subnet) divided according to subnet masks
An abbreviation for High-Definition Television that refers to high-definition systems which satisfy the following conditions.
• Vertical resolution of 750p or 1125i or greater (p = progressive
• Screen aspect ratio g of 16:9
g
• Dolby Digital audio reception and playback (or output)
A method of image scanning whereby the image data is divided into fine horizontal lines that are displayed in sequence starting from left
to right and then from top to bottom. The even-numbered lines and odd-numbered lines are displayed alternately.
A number to identify a computer connected to a network.
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.
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 to refresh the light-emitting element. The number of refresh operations per second is called the
Refresh rate and is expressed in hertz (Hz).
An abbreviation for Standard Definition Television that refers to standard television systems which do not satisfy the conditions for
g
HDTV High-Definition Television.
An abbreviation for Simple Network Management Protocol, which is the protocol for monitoring and controlling devices such as routers
and computers connected to a TCP/IP network.
This is the IP address g for the destination computer used for error notification in SNMP
g g
, i = interlace )
88
g to equipment connected to
g
.