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DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

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Drive (n.) A periodic pulse signal that conveys synchronization information.<br />

See Vertical drive (VD), on page 650; and Horizontal drive (HD),<br />

on page 631.<br />

Dropframe A timecode stream associated with scanning at a field or frame<br />

rate of 59.94 Hz, wherein timecodes of the form HH:Tu:00:00 and<br />

HH:Tu:00:01 are omitted from the count sequence whenever u<br />

(the units digit of minutes) is nonzero, so that counting frames<br />

obtains a very close approximation to clock time. This adjustment<br />

almost exactly compensates for the field or frame rate being<br />

a factor of exactly 1000 ⁄1001 slower than 60 Hz.<br />

DTV Digital television: A generic term including digital SDTV and<br />

digital HDTV. Generally, broadcast is implied.<br />

DV 1. Generally, digital video.<br />

2. A specific motion-JPEG compression technique, videotape<br />

recording format, and/or digital interface (DIF) bitstream, for<br />

Y’C B C R digital video. See DV25, DV50, and DV100, below.<br />

DV25 DV (see above), coded at 25 Mb/s. DV25 is widely implemented<br />

in consumer DVC and Digital8 equipment, and in professional<br />

D-7 (DVCPRO) and DVCAM equipment.<br />

DV50 DV (see above), coded at 50 Mb/s. DV50 is used in professional<br />

D-7 (DVCPRO50), D-9 (Digital-S), DVCAM, and DVCPRO P<br />

equipment.<br />

DV100 DV (see above), coded at 100 Mb/s. DV100 is used in<br />

DVCPRO HD equipment.<br />

DVB Digital Video Broadcasting: An organization of the EBU that standardizes<br />

and promotes DTV broadcasting. DVB advocates<br />

MPEG-2 video and audio compression, supplemented by DVB<br />

transmission standards for cable (DVB-C), satellite (DVB-S), and<br />

terrestrial (DVB-T) broadcasting (for which DVB-T specifies<br />

COFDM transmission).<br />

DVC Digital video cassette: A component SDTV digital videotape<br />

format for consumer use, taking Rec. 601 Y’C B C R video having<br />

either 480i or 576i scanning, compressing to about 25 Mb/s<br />

using the DV motion-JPEG technique (DV25), and recording on<br />

6.35 mm tape encased in a cassette of one of two sizes – small<br />

(“MiniDV”) or large.<br />

DVCAM Sony’s trademarked term for a component SDTV digital videotape<br />

format for professional use, utilizing 6.35 mm tape cassettes and<br />

recording Rec. 601 Y’C B C R video having either 480i or 576i scanning,<br />

compressed to about 25 Mb/s using the DV motion-JPEG<br />

technique.<br />

DVCPRO Digital video cassette, professional version: Panasonic’s trademarked<br />

term for the digital videotape format now standardized as<br />

SMPTE D-7; see D-7, on page 623.<br />

626 DIGITAL VIDEO AND HDTV ALGORITHMS AND INTERFACES

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