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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
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.
Furtheremore, 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.
Dolby Pro Logic Surround
As one method of decoding Dolby Surround, Dolby Pro Logic
Surround 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 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 discretely and digitally processed.
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.
Glossary
Furthermore, various advanced functions such as the multi-
angle, multilingual, and Parental Control functions are
provided with the DVD.
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.
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.
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.
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 picture or a music piece on a CD or Video CD.
Each track is assigned a track number enabling you to locate
the track you want.
Video CD
A compact disc that contains moving pictures.
The picture data uses the MPEG 1 format, one of the
worldwide standards of digital compression technology.
The picture data is compressed to about 1/140 of its original
size. Consequently, a 12 cm Video Disc can contain up to 74
minutes of moving pictures.
Video CDs also contain compact audio data. Sounds outside
the range of human hearing are compressed while the sounds
we can hear are not compressed. Video CDs can hold 6 times
the audio information of conventional audio CDs.
There are 2 versions of Video CDs.
<
Version 1.1: You can play only moving pictures and sounds.
<
Version 2.0: You can play high-resolution still pictures and
enjoy PBC functions.
This system conforms to both versions.
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