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Glossary of DVD Terms
WAEA
World Airline Entertainment Association. Discs produced for use in airplanes contain extra information in a WAEA directory. The in-flight entertainment working group of the WAEA petitioned the DVD Forum to assign region 8 to discs intended for in-flight use.
watermark
Information hidden as "invisible noise" or "inaudible noise" in a video or audio signal.
White Book
The document from Sony, Philips, and JVC, begun in 1993 that extended the Red Book compact disc format to include digital video in MPEG-1 format. Commonly called Video CD.
widescreen
A video image wider than the standard 1.33 (4:3) aspect ratio. When referring to DVD or HDTV, widescreen usually indicates a 1.78 (16:9) aspect ratio.
window
A usually rectangular section within an entire screen or picture.
Windows
See Microsoft Windows.
XA
See CD-ROM XA.
XGA
A video graphics resolution of 1024x768 pixels.
XVCD
A non-standard variation of VCD.
Y
The luma or luminance component of video: brightness independent of color.
Y/C
A video signal in which the brightness (luma, Y) and color (chroma, C) signals are separated. Also called S-video.
YCbCr
A component digital video signal containing one luma and two chroma components. The chroma components are usually adjusted for digital transmission according to ITU-R BT.601. DVD-Video's MPEG-2 encoding is based on 4:2:0 YCbCr signals. YCbCr applies only to digital video, but is often incorrectly used in reference to the YPbPr analog component outputs of DVD players.
Yellow Book
The document produced in 1985 by Sony and Philips that extended the Red Book compact disc format to include digital data for use by a computer. Commonly called CD-ROM.
YPbPr
A component analog video signal containing one luma and two chroma components. Often referred to loosely as YUV or Y, B-Y, R-Y.
YUV
In the general sense, any form of color-difference video signal containing one luma and two chroma components. Technically, YUV is applicable only to the process of encoding component video into composite video. See YCbCr and YPbPr.
ZCLV
Zoned constant linear velocity. Concentric rings on a disc within which all sectors are the same size. A combination of CLV and CAV.
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