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Knowledge sections
Glossary
DVD (Digital Versatile Disc) : DVD VIDEO is a disc fea-
turing high video/audio quality, made possible by large
recording capacity of video and audio signals of movie
software, etc. and by digital signal processing.
VIDEO CD (VCD) : This is a CD containing moving
picture. By compressing video data to about 1/120
and audio data to about 1/6, a 12 cm disc with the
same size as ordinary music CD can store mov-
ing pictures and audio for up to about 74 minutes.
The VCD includes the P.B.C.-incompatible discs
with only the playback capability (Version 1.1) and
P.B.C.-compatible discs with the menu playback
and special playback capabilities (Version 2.0)
MPEG (Moving Picture Expert Group) (DVD, VCD) :
A digital video and audio compression and decom-
pression system which is standardized as an in-
ternational standard.
Decoder: A device for restoring standard audio sig-
nal from audio data recorded based on coding into
DVD data, etc. This processing is referred to as
decoding.
Downmixing : Conversion of multichannel audio signals
of DVD into 2-channel stereo signals.
Sampling rate : Sampling refers to converting an
analog signal into digital signal by slicing the ana-
log signal into fine parts at a certain time interval
and digitizing every sliced part. The sampling rate
is the count of slicing per second. The original
sound can be reproduced more faithfully when the
sampling rate is higher.
Quantization bit : The quantization bit count refers
to the number used in digitizing the sliced parts
obtained by slicing the analog signal as described
above. The quantization bit count is the number
of bits used in digitization per second. The origi-
nal sound can be reproduced more faithfully when
the quantization bit count is larger.
Linear PCM (Pulse Code Modulation): Audio signal
format without using compression. In the DVD
which has a very large disc capacity, the linear
PCM signal using high sampling rate can be re-
corded.
Bitstream (DVD):This is the generic name given for
the flow of data based on a standard such as Dolby
Digital, DTS, MPEG, etc.
Dolby Digital : A digital audio compression technol-
ogy developed by Dolby Laboratories, Inc.
DTS : Digital surround system developed by Digital
Theater Systems, Inc.
Title/ Title No. (DVD VIDEO): The title is the larg-
est unit of video or audio recorded in DVD VIDEO.
Usually, a title corresponding to a movie product
with video software or an album (or a piece of
music) with music software. The numbers as-
signed to the titles are referred to as title numbers.
Chapter/Chapter No. (DVD VIDEO): The chapter
is a partition of video or audio that is smaller than
the title. A title is composed of multiple chapters.
The numbers assigned to the chapters are re-
ferred to as chapter numbers.
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