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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 bits 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.
Dolby Digital
Digital audio compression technology that the
Dolby Laboratories Corporation developed. This
technology conforms to 5.1-channel surround
sound. The rear channel is stereo and there is
discrete subwoofer channel in this format. Dolby
Digital provides the same 5.1 discrete channels of
high quality digital audio found in Dolby Digital
cinema audio systems. The good channel
separation is realized because the all channel data
is recorded discrete and processed in digital.
Dolby Pro Logic
Audio signal processing technology that Dolby
Laboratories Corporation developed for surround
sound. When the input signal has the surround
component, the Pro Logic process outputs the
front, center and rear signals. The rear channel is
monaural.
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.
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.