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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
surround speakers and a centre speaker. The
surround speakers output monaural sound.
Digital audio compression technology
developed by Digital Theater Systems, Inc. This
technology conforms to 5.1-channel surround.
This format comprises of stereo rear channels
and a discrete subwoofer channel. DTS provides
the same 5.1 discrete channels of high quality
digital audio. The good channel separation is
realized due to all channel data being recorded
discretely and processed digitally.
A disc that contains up to 8 hours of moving
pictures even though its diameter is the same as
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
a worldwide standard of digital compression
technology. The picture data is compressed to
about 1/40 of its original size. DVD also uses
variable rate coding technology that processes
allocated data according to the status of the
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.
Section of a picture on a data CD containing
JPEG image files.
Film based software, Video based
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.
The Interlace format is the NTSC standard
method for displaying TV images at 30 frames
per second. Each frame is scanned twice -
alternately between the even numbered scanning
lines and then odd numbered scanning lines, at
60 times per second.
Various angles of a scene, or viewpoints of the
video camera are recorded on some DVDs.
Several languages for the sound or subtitles in a
picture are recorded on some DVDs.
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 programs, programs with
search functions, and so on.
In contrast to the Interlace format, the
progressive format can reproduce 60 frames per
second by reproducing all scanning lines (525
lines for the NTSC system). The overall picture
quality increases and still images, text and
horizontal lines appear sharper. This format is
compatible with the 525 progressive format.