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Glossary
Bit rate
Value indicating the amount of video data compressed in
a DVD per second. The unit is Mbps (mega bit per second).
1 Mbps indicates that the data per second is 1,000,000
bits. The higher the bit rate is, the larger the amount of
data. However, this does not always mean that you can get
higher quality pictures.
Chapter
Sections of a picture or a music piece on a DVD that are
smaller than titles. A title is composed of several chapters.
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 to realize 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.
Dolby Pro Logic Surround
This is a method of decoding Dolby Surround, Dolby Pro
Logic Surround 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 one 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
5.1channel 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 all channel data is recorded discrete and
processed in digital.
MPEG AUDIO
International standard coding system to compress audio
digital signals authorized by ISO/IEC. MPEG 1 conforms to
up to 2-channel stereo. MPEG 2 used on DVDs conforms
to up to 7.1-channel surround.
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 as well as in
PCM, allowing you to enjoy more real audio presence.
Furthermore, various advanced functions such as the
multi-angle, multilingual, and Parental Control functions
are 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 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.
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
located 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: a data formation.