Glossary 1
Bit rateThe audio data is recorded in Dolby Digital as well as in PCM,
allowing you to enjoy more real audio presence.
Value indicating the amount of video data compressed in a
Furthermore, various advanced functions such as the multi-
DVD per second. The unit is Mbps (mega bit per second). 1
angle, multilingual, and Parental Control functions are
Mbps indicates that the data per second is 1,000,000 bits. The
provided with the DVD.
higher the bit rate is, the larger the amount of data. However,
this does not always mean that you can get higher quality
Dynamic range
pictures.
The difference between the quietest and loudest sounds
Chapterprossible in an audio signal (without distorting or getting lost in
noise). Dolby Digital and DTS soundtracks are capable of a very
Sections of a picture or a music piece on a DVD that are
wide dynamic range, delivering dramatic cinema-like effects.
smaller than titles. A title is composed of several chapters.
Each chapter is assigned a chapter number enabling you to
Interlace Scan video
locate the chapter you want.
Intelace scan marks priority part scanning line (odd number
Dolby Digitalscanning line by the example) and mark scanning line (even
number scanning line) is secondary and do one whole display as
This sound format for movie theaters is more advanced than
Dolby Pro Logic Surround. In this format, the rear speakersprimary among number much scanning lines.
output stereo sound with an expanded frequency range and a
subwoofer channel for deep bass is independently provided.MPEG AUDIO
This format is also called "5.1" because the subwoofer channelInternational standard coding system to compress audio
is counted as 0.1 channel (since it functions only when a deepdigital signals authorized by ISO/IEC. MPEG 1 conforms to up
bass effect is needed). All six channels in this format areto 2-channel stereo. MPEG 2 used on DVDs conforms to up to
recorded separately to realize superior channel separation.7.1-channel surround.
Furtheremore, since all the signals are processed digitally,
less signal degradation occurs. The name "AC-3" comes fromMulti-angle function
the fact that it is the third audio coding method to be
Various angles, or viewpoints of the video camera, for a scene
developed by the Dolby Laboratories.
are recorded on some DVDs
Dolby Pro Logic Surround
Multilingual function
As one method of decoding Dolby Surround, Dolby Pro Logic
Several languages for the sound or subtitles in a picture are
Surround produces four channels from two-channel sound.
recorded on some DVDs.
Compared with the former Dolby Surround system, Dolby Pro
Logic Surround reproduces left-to-right panning more
Parental Control
naturally and localizes sounds more precisely. To take full
A function of the DVD to limit playback of the disc by the age of
advantage of Dolby Pro Logic Surround, you should have one
the users according to the limitation level in each country. The
pair of rear speakers and a center speaker. The rear speakers
limitation varies from disc to disc; when it is activated,
output monaural sound.
playback is completely prohibited, violent scenes are skipped
or replaced with other scenes and so on.
DTS
Digital audio compression technology that the Digital Theater
Playback Control (PBC)
Systems, Inc. developed. This technology conforms to 5.1-
Signals encoded on Video CDs (Version 2.0) to control
channel surround. The rear channel is stereo and there is
playback.
discrete subwoofer channel in this format. DTS provides the
By using menu screens recorded on Video CDs with PBC
same 5.1 discrete channels of high quality digital audio. The
functions, you can enjoy playing simple interactive programs,
good channel separation is realized because the all channel
programs with search functions, and so on.
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.
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