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DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

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D-10 A SMPTE-standard component SDTV digital videotape format for<br />

professional use, utilizing 1 ⁄2-inch tape in Beta-type cassettes and<br />

recording Rec. 601 Y’C B C R , 4:2:2 signals based upon either 480i<br />

or 576i scanning, mildly compressed to about 50 Mb/s using<br />

a motion-JPEG technique. Also known by Sony’s trademarked<br />

term MPEG IMX.<br />

D-11 A SMPTE-standard component HDTV digital videotape format for<br />

professional use, utilizing 1 ⁄2-inch tape in Beta-type cassettes and<br />

recording Y’C B C R signals based upon 1440¥1080 image, scanned<br />

progressive or interlaced at any of several frame rates, chroma<br />

subsampled 3:1:1, and mildly compressed to about 50 Mb/s using<br />

a motion-JPEG technique. Also known by Sony’s trademarked<br />

term HDCAM.<br />

D-12 A SMPTE-standard component HDTV digital videotape format for<br />

professional use, utilizing 6.35 mm tape encased in a cassette of<br />

one of three sizes (small, medium, or large), recording 720p,<br />

1080i, or 1080p, 4:2:2 signals, compressed to about 100 Mb/s<br />

using the DV motion-JPEG technique (DV100). Also known by<br />

Panasonic’s trademarked term DVCPRO HD.<br />

D16 Quantel’s proprietary format for nonrealtime recording of digital<br />

film frames, each 2880×2048, on 576i D-1 videotape. Each film<br />

frame comprises sixteen 720×512 subimages; each is stored as<br />

one video frame.<br />

D 65<br />

See Reference white, on page 643; and CIE D 65 , on page 617.<br />

Data rate Information rate of digital transmission, in bits per second (b/s) or<br />

bytes per second (B/s). Not to be confused with bandwidth.<br />

Datum See 0 H datum and 0 V datum, on page 609.<br />

DC, direct current 1. Historically, an electrical current or voltage having no periodic<br />

reversal in polarity.<br />

2. In modern usage, having zero frequency.<br />

3. In video, a signal having frequency substantially lower than the<br />

frame rate.<br />

4. In JPEG and MPEG, that spatial frequency component having<br />

uniform response over an 8×8 block. Distinguished from AC (3),<br />

on page 612.<br />

DC restoration Clamp (1) at blanking level (or in low-quality systems, at synctip<br />

level).<br />

DCT 1. Discrete cosine transform: In video, the mathematics at the<br />

heart of the JPEG and MPEG algorithms.<br />

2. An obsolete digital videotape format from Ampex; in this<br />

context, DCT is a registered trademark of Ampex.<br />

624 DIGITAL VIDEO AND HDTV ALGORITHMS AND INTERFACES

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