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Glossary
Aspect ratio
The ratio of vertical and horizontal sizes of a displayed
image. The horizontal vs. vertical ratio of conventional TVs is
4:3, and that of wide-screens is 16:9.
Chapter
Refers to individual chapters included in a title.
Composite video signal
Refers to video signal comprised of three kinds of signals
combined: an image signal made up of luminance and
chrominance signals using the frequency multiplication
technique; burst signal providing the basis for color
reproduction; and synchronization signal.
Component video signal
A video signal system where parts of information necessary
for reproducing image signal comprised of the three primary
colors of light are transmitted via separate signal lines. Types
of signal, such as R/G/B, Y/P
B/PR, etc., are available.
Disc menu
A screen display prepared for allowing selection of images,
sounds, subtitles, multiangles, etc. recorded on a DVD.
Interlaced scan
In the conventional video system, a picture is shown
on the display monitor in two halves. The Interlaced
scan system places lines of the second half of the
picture in-between lines of the first half of the picture.
JPEG
A still-picture data compression system proposed by the
Joint Photographic Expert Group, which features small
decrease in image quality in spite of its high compression
ratio.
Linear PCM (PCM: Pulse Code Modulation)
A system for converting analog sound signal to digital signal
for later processing, with no data compression used in
conversion.
Letter box
A method of displaying wide images like movies in the center
of a 4:3 TV screen with no part of the image deleted, by
placing black bands on the top and bottom of the screen.
This name has resulted from the screen form looking literally
like a letter box.
MP3
A file format with a sound data compression system. “MP3” is
the abbreviation of Motion Picture Experts Group 1
(or MPEG-1) Audio Layer 3. By using MP3 format, one CD-R
or CD-RW can contain about 10 times as much data volume
as a regular CD can.
Multi-angle
By recording multiple scenes progressing at the same time in
a single title, the user can select view angles. This feature is
called the multiangle function.
Multichannel
DVD is specified to have each sound track constitute one
sound field. Multichannel refers to a structure of sound tracks
having three or more channels.
Multilanguage
When a title is created to cope with multiple languages, it is
generally called a multilanguage title.
Parental lock
A feature of this system to automatically determine whether or
not to reproduce particular DVD software by comparing its
parental level (a measure of undesirability of scenes, etc.
from educational viewpoint) set for the software beforehand
with that set on this system by the user; if the software’s level
is less restrictive than the user-set level, it will be reproduced.
Playback control (PBC)
Refers to the signal recorded on video CDs or SVCDs for
controlling reproduction. By using menu screens recorded on
a Video CD or SVCD that supports PBC, you can enjoy
interactive-type software as well as software having a search
function.
Progressive scan
Progressive scan displays all the horizontal lines of a picture
at one time, as a single frame. This system can convert the
interlaced video from DVD into progressive format for
connection to a progressive display. It dramatically increases
the vertical resolution.
Region code
A system for allowing discs to be played back only in the
regions designated beforehand. All the countries in the world
are divided into six regions, each region being identified by a
specified region code (or region number). If the region code
given to a disc includes a numeral which matches one in the
region code of a player, the player can play back the disc.
Surround
A system for creating three-dimensional sound fields full of
realism by arranging multiple speakers around the listener.
Sampling frequency
Frequency of sampling data when analog data is converted
to digital data. Sampling frequency numerically represents
how many times the original analog signal is sampled per
second.
Transfer rate
The rate of transferring digital data. Usually the measure is in
baud per second. The DVD system applies a variable
transfer rate system for high efficiency.
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