Glossary
Decoder
A decoder restores the coded audio signals on DVDs to normal. This is called decoding.
Dolby Digital
This is a method of coding digital signals developed by Dolby Laboratories. Apart from stereo
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
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 fi lms.
Video:Recorded at 25 frames/50 fi elds per second (PAL discs) or 30 frames/60 fi elds 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 fi elds. A regular television shows these fi elds 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 fi elds, so the picture may appear blurred, but overall quality is high.
A fi eld still is not blurred, but it has only half the information of a frame still so picture quality is lower.
I/P/B
MPEG 2, the video compression standard adopted for use with
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:
This picture is calculated by comparing past and future I and
JPEG (Joint Photographic Experts Group) This is a system used for compressing/decoding color still pictures. If you select JPEG as the storage system on digital cameras, etc., the data will be compressed to
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.
Playback control (PBC)
If a Video CD has playback control, you can select scenes and information with menus.
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 fi le size that is smaller than that of MP3.
REFERENCE ENGLISH
RQTX0029
37
RQT8043
