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Digital Video Disc, plastic disc containing a recording of digital data that
can produce moving pictures when played in a special device attached to a computer
or an ordinary television set. Discs for pre-recorded digital video, which are
currently referred to as DVD-Video, are just one part of a new family of standards
for digital disc recording purposes that the manufacturers concerned wish to
call DVD; for copyright reasons they claim that this is short for digital
versatile disc. The group of DVD disc formats also includes various forms
of data recording for computer purposes, including discs that contain pre-recorded
data (DVD-ROM) and discs that can be rewritten many times (DVD-RAM). These are
several times the capacity of CD-ROMs. The simple single-layer version of the
DVD holds between 3.7 and 4.38 gigabytes (with double-layer versions holding
15.9 gigabytes), compared to the 650 megabytes of CD-ROMs. These higher capacity
discs are used particularly for computer games and in multimedia applications.
Digital video discs are a simple refinement of the laser video discs and compact
discs (CDs), as developed by Philips (Netherlands) and Sony (Japan). However,
other Japanese manufacturers have also become involved in developing competing
variants of the technology. All the forms of the new digital video discs have
the same external dimensions as CDs and CD-ROMs, that is, they are 120 mm (about
4½ in) in diameter and 1.2 mm thick, but the microscopic pits in their
surface that record the data are of roughly half the size and spacing. The density
of information that can be recorded on the disc surface is thus increased several
times; this increase has been made possible by more perfect control of the laser-reading
mechanism in the player, and also by using a laser that produces light of a
shorter wavelength. The new video discs are being produced in four forms that
contain either a second recording layer on the other side of the disc, to be
read by a second laser, or a second recording layer below the semi-transparent
surface of the first recording, or both of these together. The technique of
having two layers on the same side of the disc depends on refocusing the laser
beam reading the discs so that the lower layer is read through the upper layer.
These possibilities double or quadruple the amount of information contained
compared to the simplest, single-sided, single-layered disc, and mean that longer
films, or alternative versions of the same film, can be contained on a single
disc. Also, using the system for compressing moving-picture data in digital
form that is used for digital broadcasting in Europe, it is possible to put
a recording of a two-hour film on one disc, and a four-hour film on a double-layer
disc, with roughly the same quality as that given by the 30-cm (12-in) LaserVision
videodiscs, which have finer definition than videotape. For mass production
of pre-recorded material, the single-sided, single-layer discs are pressed in
the same way as CDs are at present, for the same very low production cost. However,
the extra layers for the extended versions have to be laminated together in
a further production step, which increases their basic cost somewhat. In early
2002 nine leading electronics companies revealed that they had jointly established
basic specifications for a new generation of DVDs, known as Blu-ray discs. By
working together on the development of the disc the companies had reduced the
problems of conflicting formats that DVDs had suffered from earlier. Blu-ray
discs are so-named because they are used in conjunction with a blue laser, capable
of storing much more data than the red rays currently used. Blu-ray discs are
capable of holding up to 27 gigabytes of sound and video data on a single-sided,
single-layer disc, and this could be increased to over 50 gigabytes on a single-sided,
double-layer disc. Discs similar to digital video discs are produced for distributing
recorded sound, and these contain either longer recordings or higher-quality
recordings than existing CDs. So far, complete agreement on the technical standards
for all types of DVD has not been reached, but nevertheless the manufacturers
intend that these alternatives will eventually take over from present-day CDs,
CD-ROMs, laser video discs, and even displace video cassette recorders for recorded
video.
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