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GB
The audio data is recorded in Dolby Digital
as well as in PCM, allowing you to enjoy
more realistic audio presence.
Furthermore, various advanced functions
such as the multi-angle, multilingual, and
Parental Control functions are provided with
the DVD.
Film based software, Video based
software
DVDs can be classified as Film based or
Video based software. Film based DVDs
contain the same images (24 frames per
second) that are shown at movie theatres.
Video based DVDs, such as television
dramas or sit-coms, displays images at 30
frames (or 60 fields) per second.
Multi-angle function
Va rious angles, or viewpoints of the video
camera, for a scene are recorded on some
DVDs.
Multilingual function
Several languages for the sound or subtitles
in a picture are recorded on some DVDs.
Parental Control
A function of the DVD to limit playback of
the disc by the age of the users according to
the limitation level in each country. The
limitation varies from disc to disc; when it is
activated, playback is completely prohibited,
violent scenes are skipped or replaced with
other scenes and so on.
Playback Control (PBC)
Signals encoded on VIDEO CDs (Version
2.0) to control playback.
By using menu screens recorded on VIDEO
CDs with PBC functions, you can enjoy
playing simple interactive programmes,
programmes with search functions, and so
on.
Dolby Surround Pro Logic
As one method of decoding Dolby
Surround, Dolby Surround Pro Logic
produces four channels from two-channel
sound. Compared with the former Dolby
Surround system, Dolby Surround Pro Logic
reproduces left-to-right panning more
naturally and localizes sounds more
precisely. To take full advantage of Dolby
Surround Pro Logic, you should have one
pair of rear speakers and a center speaker.
The rear speakers output monaural sound.
DTS
Digital audio compression technology that
the Digital Theater Systems, Inc. developed.
This technology conforms to 5.1-channel
surround. The rear channel is stereo and
there is discrete subwoofer channel in this
format. DTS provides the same 5.1 discrete
channels of high quality digital audio. The
good channel separation is realized because
the all channel data is recorded discrete and
processed in digital.
DVD
A disc that contains up to 8 hours of moving
pictures even though its diameter is the same
as a CD.
The data capacity of a single-layer and
single-sided DVD, at 4.7 GB (Giga Byte), is
7 times that of a CD. Furthermore, the data
capacity of a dual-layer and single-sided
DVD is 8.5 GB, a single-layer and double-
sided DVD 9.4 GB, and a dual-layer and
double-sided DVD 17 GB.
The picture data uses the MPEG 2 format,
one of the worldwide standards of digital
compression technology. The picture data is
compressed to about 1/40 of its original size.
The DVD also uses the variable rate coding
technology that changes the data to be
allocated according to the status of the
picture.
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