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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 ("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.
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 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: a data formation.
NTSC
National TV Systems Committee: a video standard used in
USA.
PAL
Phase Alternation Line: a video standard used in Europe.