sign in / register
MARC21-007: Videorecording format
Properties Listed by Language
Laser optical (reflective) videorecording system that uses a digital technique called PCM (Pulse Code Modulation) to represent video information on a grooveless, smooth, round plastic disc. The disc is read (played back) by a weak laser beam that registers data appearing on the disc as tiny pits or depressions of uniform length.
DVDs are usually 4 3/4 inch in diameter (but a smaller 3 inch diameter disc may be produced commercially in some cases) and the disc or its packaging usually bear the term or trademark: DVD, DVD VIDEO, or VIDEO CD (in this case, the trademark is the standard one for COMPACT DISC, but with the added phrase DIGITAL VIDEO below it). This system has been in use commercially since late 1996.
See a problem?
Make an issue out of it...