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DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

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transmission; or to color difference components having unspecified,<br />

nonstandard, or unknown scaling.<br />

U-matic An analog videocassette system for 480i NTSC or 576i PAL, using<br />

color-under recording on 3 ⁄4-inch tape; its successor (with higher<br />

bandwidth) is denoted U-matic SP.<br />

Uncompressed In video, signal recording or transmission without using JPEG or<br />

MPEG techniques. (Chroma subsampling effects lossy compression<br />

with a ratio of about 1.5:1 or 2:1; however, the term compression<br />

in video is reserved for JPEG, M-JPEG, or MPEG techniques.)<br />

Unit See IRE unit, on page 633.<br />

Upconversion In video, conversion to a scanning standard, usually at the same<br />

frame rate, having substantially higher pixel count (e.g., SDTV to<br />

HDTV).<br />

Upsampling Resampling where more output samples are produced than the<br />

number of input samples provided.<br />

V See U, V, on page 649.<br />

Valid The condition where a combination of component signals represents<br />

a combination that is R’G’B’-legal, that is, where all of the<br />

corresponding R’, G’, and B’ lie within their reference ranges.<br />

Value In color science, measures of lightness apart from CIE L*.<br />

VCR Videocassette recorder. Implicitly, consumer-grade: In professional<br />

usage, VTR (with T for tape) is used even if the tape<br />

medium is encased in a cassette.<br />

Vertical blanking interval<br />

(VBI)<br />

Those scan lines of a field (or frame) that are precluded by a scanning<br />

standard from containing picture. The original FCC, NTSC,<br />

and EIA standards measured vertical blanking in microseconds;<br />

modern usage counts integral scan lines. The vertical interval may<br />

contain nonpicture video – uch as test signals (VITS), timecode<br />

(VITC), teletext, or other data – that is blanked by display<br />

equipment.<br />

Vertical drive (VD) A pulse that conveys vertical synchronization information. Nowadays<br />

this information is usually extracted from sync (3), rather<br />

than requiring a separate signal.<br />

Vertical frequency 1. The vertical component of spatial frequency.<br />

2. In interlaced scanning, field rate; in progressive scanning, frame<br />

rate.<br />

Vertical interval Vertical blanking interval (VBI); see above.<br />

Vertical sync Those nonpicture elements of a video signal that mark the<br />

boundary between fields (or frames).<br />

650 DIGITAL VIDEO AND HDTV ALGORITHMS AND INTERFACES

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