Glossary
BitstreamI/P/B
This is the digital form of multiple channel audio data (e.g., 5.1 chan-MPEG, the video compression standard adopted for use with
nel) before it is decoded into its various channels.DVD-Video, codes frames using these 3 picture types.
I: Intra coded picture (I-picture)
DecoderThis is the standard picture and is a complete picture in itself.
A decoder restores the coded audio signals on DVDs to normal.This means it has the best picture quality and is the best to use
This is called decoding.when adjusting the picture.
P: Predictive coded picture (P-picture)
Direct navigatorThis picture is calculated based on past I or P-pictures.
This is a list of programs you have recorded. You can select pro-B: Bidirectionally-predictive coded picture (B-picture)
grams from the list to view. The list also shows the date and time ofThis picture is calculated by comparing past and future I and
recording, the channel, and the titles of titled programs. The select-P-pictures so it has the lowest volume of information.
ed program is played in the background, making selection even
simpler.Linear PCM (pulse code modulation)
PCM is the usual digital method used for music CDs. DVDs have a
Dolby Digitalgreater volume so they use linear PCM, which has a higher sam-
This is a method of coding digital signals developed by Dolby Labo-pling rate. Compressed PCM signals are called packed PCM
ratories. Apart from stereo (2-channel) audio, these signals can also(PPCM).
be 5.1-channel audio. A large amount of audio information can be
recorded on one disc using this method.Pan & Scan/Letterbox
In general, DVD-Video are produced with the intention that they be
Dolby Pro Logicviewed on a widescreen television with an aspect ratio of 16:9. This
A surround system where a 4-channel audio track is recorded asmeans you can view most material with the intended aspect ratio on
2 channels and then is restored to 4 channels for play. The surrounda widescreen television.
channel is monaural and can reproduce up to 7 kHz.Material with this ratio will not fit onto a standard television with an
aspect ratio of 4:3. Two styles of picture, ?Pan & Scan? and ?Letter-
DTS (Digital Theater Systems)box?, deal with this problem.
This surround system is used in many movie theaters around thePan&Scan: The sides are cut off so the picture fills the screen.
world. There is good separation between the channels, so realisticLetterbox: Black bands appear at the top and bottom of the picture
sound effects are possible.so the picture itself appears in an aspect ratio of 16:9.
Dynamic rangePlayback control (PBC)
Dynamic range is the difference between the lowest level of soundIf a Video CD has ?playback control? written on it or its jacket, it
that can be heard above the noise of the equipment and the highestmeans that particular scenes or information can be selected for
level of sound before distortion occurs.viewing interactively with the television using the menu screen. This
unit can play Video CDs with playback control.
Film and videoUsing menus to control play of a Video CD is called ?menu play? in
DVDs are recorded using either film or video. Film is recorded atthese operating instructions.
24 frames per second, the rate movies are filmed at, although some
recent progressive material is recorded at 30 frames per second.Play list
Video is recorded at 30 frames per second.This is a collection of scenes. It enables you to play these scenes in
succession or to select specific ones to play.
ReferenceFrame still and field still
A still is shown when you pause a moving picture. A frame still isProgram
made up of two alternating fields, so the picture may appear blurred,This is a division of a DVD-RAM.
but overall quality is high.
A field still is not blurred, but it has only half the information of aSampling rate
frame still so picture quality is lower.This is the number of samples of sound taken per second during
Frames are the still pictures that go together to make a moving pic-conversion to a digital signal. Sampling frequency is expressed in
ture. There are about 30 frames shown each second.kilohertz (kHz). A high sampling frequency results in a sound close
One frame is made up of two fields. A regular television shows theseto the original when played back.
fields one after the other to create frames.
Title/Chapter
Interlace and progressive outputDVD-Video are divided up into large sections, titles, and smaller
NTSC, the video signal standard, has 480 interlaced (i) scan lines,sections, chapters. The numbers allocated to these sections are
whereas progressive scanning uses twice the number of scan lines.called title numbers and chapter numbers.
This is called 480P. The 480P video signals output from this unit?s
480P COMPONENT VIDEO OUT (progressive) terminals allowsTrack
you to enjoy higher quality pictures than if the signals were outputThis is the smallest division on DVD-Audio, CD, and Video CD, and
from the VIDEO OUT, S VIDEO OUT or COMPONENT VIDEO OUTusually equates to a single song.
(interlace) terminals.
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RQT5741 |
ACEC
