References
Glossary
Chapter
This is the smallest division on DVD and is roughly equivalent to a track.
Title
This is the largest division on DVD.
Track
This is the smallest division on Video CD and Audio CD, and usually equates to a single song.
PBC (Playback control)
This method of controlling disc play is included on version 2.0 Video CDs. You are able to interact with the disc through menus.
Digital audio
Bitstream
This is the digital form of multiple channel audio data (e.g. 5.1 channel) before it is decoded into its various channels.
Decoder
A decoder restores the coded audio signals on DVDs to normal. This is called decoding.
PCM (Pulse code modulation), Linear PCM
PCM is the usual digital method used for Audio CDs. DVDs have a greater volume so they use linear PCM, which has a higher sampling rate.
Sampling rate
This is the number of samples of sound taken per second during conversion to a digital signal. Sampling frequency is expressed in kilohertz (kHz). A high sampling frequency results in a sound close to the original when played back.
MP3
A method of compressing audio, MPEG Audio Layer 3 (MP3) allows audio to be reduced up to one tenth its original size without overtly hurting audio quality.
When creating MP3 files to play on this unit
•Disc formats: ISO9660 level 1 and level 2 (except for extended formats)
Files: MP3 files with the suffix “.mp3” or “.MP3”
•This unit is not compatible with files with a sampling rate of 32 kHz.
•This unit is compatible with
sessions to a minimum to avoid this.
• To have this unit play files in a cer- root | Example: | ||
tain order, prefix folder and file |
| ||
names with numbers in the order you |
| 001 | |
want to play them. This may not work | 001.mp3 | ||
in all cases. | |||
002.mp3 | |||
|
| 003.mp3 | |
001.mp3
002.mp3
003003.mp3 004.mp3
001.mp3
002.mp3
003.mp3
Video
Frame
Frames are the still pictures that go together to make a moving picture. There are about thirty frames shown each second.
Field
One frame is made up of two fields. A regular television shows these fields one after the other to create frames.
Frame still and field still
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
MPEG 2, the video compression standard adapted for use with DVD, codes frames using these three picture types.
I:Intra coded picture
This is the standard picture and is a complete picture in itself. This means it has the best picture quality and is the best to use when adjusting the picture.
P: Predictive coded picture
This picture is calculated based on past I and
B:
This picture is calculated by comparing past and future I and P- pictures so it has the lowest volume of information.
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