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Glossary

U
UDP

User Datagram Protocol (UDP/IP: by Internet Protocol Layer4); can be also used to monitor or control some devices. Compare to TCP.

UNBALANCED

An audio input/output where one of the two output terminals is at ground potential.

UHDTV

Ultra high Definition Television. A UHDTV resolution consists a computer format between 2560 x 1440 to 7680 x 4320 pixels.

UL

Underwriter's Laboratories (U.S.A.)

UNDERSCAN

Output image size. In Underscan mode, the entire image often appears as a rectangle centered on the display screen with a black border around it. Compare to OVERSCAN.

UP-CONVERTER

Device that converts a computer graphics image into a Higher (up) resolution computer format, by changing the horizontal and the vertical scan rates.

USB

Universal Serial Bus, for computer peripherals.

URL

In computing, a Uniform Resource Locator (URL) specifies where a known resource is available and the mechanism for retrieving it. It is also referred to as a Universal Resource Locator and in many technical documents and verbal discussions it is often used as a synonym for URI(Uniform Resource Identifier).

U.V

Sometimes called DR, DB or PR, PB. It is the difference of color versus the white (Y) Luminance. U=DR=R-Y and V=DB=B-Y (see Component).

U.XGA

Ultra eXtended Graphic Array. Non-interlaced. - Standard computer format consisting of 1600 x 1200 pixels. The aspect ratio is 4:3.

V
VERTICAL FREQUENCY

see refresh rate.

VESA

Video Electronics Standards Association. Organization that sets format standards for computer displays.

VGA

Video Graphics Array. Analog computer format (first introduced by IBM®) with Horizontal & Vertical separated sync. VGA is a 640 x 480 resolution at 60 HZ or 70 Hz (non-interlaced vertical scan rate).

VIDEO AMPLIFIER

Amplifier used for video signals. Enables a signal to be transmitted over a long distance (see Booster).

VIDEO BOOSTER

see Booster.

VIDEO CONVERTER

see Scan Converter.

VIDEO STANDARDS

TV/Video system also called TV or HDTV standard. The main worldwide TV standards are PAL, SECAM and NTSC.

W
WIDESCREEN

TV & Movie Format used for wide screen televisions (see Aspect Ratio). Also slang for SOFT EDGE BLENDING.

WHSXGA

Wide Hex Super eXtended Graphics Array - Standard computer format consisting of 6400 x 4096 pixels. The aspect ratio is 25:16.

WHUXGA

Wide Hex Ultra eXtended Graphics Array - Standard compuUter format consisting of 7680 x 4800 pixels. The aspect ratio is 16:10.

WQSXGA

Wide Quad Super eXtended Graphics Array - Standard computer format consisting of 3200 x 2048 pixels. The aspect ratio is 25:16.

WQXGA

Wide Quad eXtended Graphics Array - Standard computer format consisting of 2560 x 1600 pixels. The aspect ratio is 16:10.

WSVGA

Widescreen Super Video Graphics Array - Standard computer format consisting of 964 x 544 or 1024 x 600 pixels. The aspect ratio is 16:9.

WSXGA

Widescreen Super eXtended Graphics Array - Standard computer format consisting of 1440 x 900 pixels. The aspect ratio is 16:10.

WSXGA+

Widescreen Super eXtended Graphics Array Plus- Standard computer format consisting of 1680 x 1050 pixels. The aspect ratio is 16:10.

WVGA

Wide eXtended Graphics Array – Standard computer format consisting of 3 resolutions: 840 x 480, 848 x 480 and 854 x 480 pixels. The aspect ratio is 16:9.

WXGA

Widescreen eXtended Graphics Array card - Standard computer format consisting of 1280 x 768 or 1280 x 800 pixels.

WUXGA+

Widescreen Ultra eXtended Graphics Array Plus- Standard computer format consisting of 1920 x 1200 pixels. The aspect ratio is 16:10.