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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 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.
Component video 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).
Composite video 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.
Contrast 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".
Dolby Digital 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.
HDTV 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
g, i =interlaceg)
Screen aspect ratio
g of 16:9
Dolby Digital
g audio reception and playback (or output)
Interlace 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.
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 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).
SDTV An abbreviation for Standard Definition Television that refers to standard television systems which do not satisfy the conditions for
HDTV
g High-Definition Television.
SNMP 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.
Squeeze mode In this mode, wide-screen images in 16:9 mode are compressed in the horizontal direction so that they are stored on the recording
medium as 4:3 images.
When these images are played back by the projector in squeeze mode, they are restored to their original 16:9 format.
sRGB An international standard for colour intervals that was formulated so that colours that are reproduced by video equipment can be handled
easily by computer operating systems (OS) and the Internet. If the connected source has an sRGB mode, set both the projector and the
connected signal source to sRGB.
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