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Glossary
Decoder
A decoder restores the coded audio signals on DVDs to normal.
This is called decoding.
DivX
DivX is a popular media technology created by DivX, Inc. DivX
media files contain highly compressed video with high visual
quality that maintains a relatively small file size.
Dolby Digital
This is a method of coding digital signals developed by Dolby
Laboratories. Apart from stereo (2-channel) audio, these signals
can also be multi-channel audio. A large amount of audio
information can be recorded on one disc using this method.
DTS (Digital Theater Systems)
This surround system is used in many movie theaters around
the world. There is good separation between the channels, so
realistic sound effects are possible.
Dynamic range
Dynamic range is the difference between the lowest level of
sound that can be heard above the noise of the equipment and
the highest level of sound before distortion occurs.
Film and video
DVD-Videos are recorded using either film or video. This unit
can determine which type has been used, then uses the most
suitable method of progressive output.
Film:
Recorded at 25 frames per second (PAL discs) or 24
frames per second (NTSC discs). (NTSC discs recorded
at 30 frames per second as well). Generally appropriate
for motion picture films.
Video:
Recorded at 25 frames/50 fields per second (PAL
discs) or 30 frames/60 fields per second (NTSC discs).
Generally appropriate for TV drama programs or
animation.
Frame still and field still
Frames are the still pictures that go together to make a moving
picture.
There are about 30 frames shown each second.
One frame is made up of two fields. A regular television shows
these fields one after the other to create frames.
A still is shown when you pause a moving picture. A frame still
is made up of two alternating fields, so the picture may appear
blurred, but overall quality is high.
A field still is not blurred, but it has only half the information of a
frame still so picture quality is lower.
I/P/B
I:
Intra coded picture
This picture has the best quality and is the best to use when
adjusting the picture.
P:
Predictive coded picture
This picture is calculated based on past I or P-pictures.
B:
Bidirectionally-predictive coded picture
This picture is calculated by comparing past and future I and
P-pictures so it has the lowest volume of information.
JPEG (Joint Photographic Experts Group)
This is a system used for compressing/decoding colour still
pictures. If you select JPEG as the storage system on digital
cameras, etc., the data will be compressed to 1/10–1/100 of its
original size. The benefit of JPEG is less deterioration in picture
quality considering the degree of compression.
Linear PCM (Pulse Code Modulation)
These are uncompressed digital signals, similar to those found
on CDs.
MP3 (MPEG Audio Layer 3)
An audio compression method that compresses audio to
approximately one tenth of its size without any considerable
loss of audio quality.
MPEG4
A compression system for use on mobile devices or a network,
that allows highly efficient recording at a low bit rate.
Playback control (PBC)
If a Video CD has playback control, you can select scenes and
information with menus.
Progressive/Interlace
The PAL video signal standard has 576 interlaced (i) scan lines,
whereas progressive scanning, called 576p, uses twice the
number of scan lines. For the NTSC standard, these are called
480i and 480p respectively.
Using progressive output, you can enjoy the high-resolution
video recorded on media such as DVD-Video.
Your television must be compatible to enjoy progressive video.
Sampling frequency
Sampling is the process of converting the heights of sound
wave (analog signal) samples taken at set periods into digits
(digital encoding).
Sampling frequency is the number of samples taken per
second, so larger numbers mean more faithful reproduction of
the original sound.
WMA (Windows Media
TM
Audio)
WMA is a compression format developed by Microsoft
Corporation. It achieves the same sound quality as MP3 with a
file size that is smaller than that of MP3.
Glossary
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