HT545545WEn.bookPage13Friday,March31,20063:00PM | B: | |
Glossary |
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Decoder | I/P/B | |
A decoder restores the coded audio s gnals on DVDs to normal. This is | MPEG 2, the video compression standard adopted for use with | |
called decoding. | ||
| I: Intra coded picture | |
DivX | This picture has the best quality and is the best to use when adjusting | |
DivX is a popular media technology c eated by DivX, Inc. DivX media files | the picture. | |
P: Predictive coded picture | ||
contain highly compressed video with high visual quality that maintains a | ||
This picture is calculated based on past I- or | ||
relatively small file size. | ||
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Dolby Digital | This picture is calculated by comparing past and future I- and | |
This is a method of coding digital signals developed by Dolby | ||
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Laboratories. Apart from stereo | JPEG (Joint Photographic Experts Group) | |
be | ||
This is a system used for compressing/decoding color still pictures. If you | ||
recorded on one disc using this method. | ||
select JPEG as the storage system on digital cameras, etc., the data will | ||
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DTS (Digital Theater Systems) | be compressed to | |
less deterioration in picture quality considering the degree of | ||
This surround system is used in many movie theaters around the world. | ||
compression. | ||
There is good separation between the channels, so realistic sound effects | ||
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are possible. | Linear PCM (pulse code modulation) | |
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Dynamic range | These are uncompressed digital signals, similar to those found on CDs. | |
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Dynamic range is the difference between the lowest level of sound that | MP3 (MPEG Audio Layer 3) | |
can be heard above the noise of the equipment and the highest level of | ||
An audio compression method that compresses audio to approximately | ||
sound before distortion occurs. | ||
one tenth of its size without any considerable loss of audio quality. | ||
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Glossary
Film and video
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.
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/Interlaced
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
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 MediaTM 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.
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