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GLOSSARY
Bit rate
Value indicating the amount of video
data compressed in a DVD per
second. The unit is Mbps (megabit
per second). 1 Mbps indicates that
the data per second is 1,000,000 bits.
The higher the bit rate, the larger the
amount of data. However, this does
not always mean higher quality
pictures.
Chapter
Sections of a picture or a music piece
on a DVD that are smaller than titles.
Many titles are composed of several
chapters, but many others are not.
Each chapter is assigned a chapter
number enabling you to locate the
chapter you want.
Dolby Digital (“5.1”, “AC-3”)
This sound format for movie theaters
is more advanced than Dolby Pro
Logic Surround. In this format, the
rear speakers output stereo sound
with an expanded frequency range
and a subwoofer channel for deep
bass is independently provided. This
format is also called “5.1” because
the subwoofer channel is counted as
0.1 channel (since it functions only
when a deep bass effect is needed).
All six channels in this format are
recorded separately for superior
channel separation. Furthermore,
since all the signals are processed
digitally, less signal degradation
occurs. The name “AC-3” comes
from the fact that it is the third audio
coding method to be developed by
the Dolby Laboratories Licensing
Corporation.
Manufactured under license from
Dolby Laboratories. "Dolby", "AC-3",
"Pro Logic" and the Double-D symbol
are trademarks of Dolby Laboratories.
Confidential Unpublished Works. ©
1992.1997 Dolby Laboratories, Inc. All
rights reserved.
Dolby Pro Logic Surround
This is a method of decoding
surround recordings that produces
four channels from two-channel
sound. Compared with the former
Dolby Surround system, Dolby Pro
Logic Surround reproduces left-to-
right panning more naturally and
localizes sounds more precisely. To
take full advantage of Dolby Pro Logic
Surround, you should have a pair of
rear speakers and a center speaker.
The rear speakers output monaural
sound.
DTS
Digital audio compression technology
developed by Digital Theater
Systems, Inc. This technology
conforms to 5.1-channel surround.
The rear channels are stereo and
there is a discrete subwoofer
channel in this format. DTS provides
5.1 discrete channels of high quality
digital audio. Good channel
separation is realized, because all
channels are recorded discretely and
processed digitally.
Manufactured under license from
Digital Theater Systems, Inc. US Pat.
No. 5,451,942 and other worldwide
patents issued and pending. "DTS"
and "DTS Digital Surround" are
trademarks of Digital Theater
Systems, Inc. © 1996 Digital Theater
Systems, Inc. All rights reserved.
MPEG AUDIO
International standard coding system
to compress audio digital signals
authorized by ISO/IEC. MPEG 1
conforms to up to 2-channel stereo,
used on some DVD’s as alternate
(other language) track.
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.
The audio data is recorded in Dolby
Digital, DTS and/or PCM, allowing
you to enjoy more natural audio
presence. Furthermore, various
advanced functions such as multi-
angle, multilingual, and subtitles may
be provided with the DVD.
Multi-angle function
Various 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 some (particulary US)
DVD’s to limit playback of the disc by
the age of the users. 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.
Title
The longest sections of a picture or a
music piece on a DVD; a movie, etc.,
for a picture piece on video software;
or an album, etc., for a music piece
on an audio software. Each title is
assigned a title number enabling you
to locate the title you want.
Track
Sections of a music piece on a CD.
Each track is assigned a track
number enabling you to locate the
track you want.
PCM
Pulse code modulation, an
uncompressed data formation.
NTSC
National TV Systems Committee: a
video standard used in USA.
PAL
Phase Alternation Line: a video
standard used in many European
countries.