Glossary, Bitstream, Chapter – Panasonic DVD-PV40 Manuel d'utilisation

Page 38: Dolby digital, Dolby pro logic, Dts (digital theater systems), Dynamic range, Field, Frame, Frame still and field still

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Glossary

Bitstream

This is the digital form of multiple channel
audio data {e.g., 5.1 channel) before it is

decoded into its various channels.

Chapter

This is the smallest division on DVDs and
is roughly equivalent to a track.

Dolby Digital

This is a method of coding digital signals
developed by Dolby Laboratories. Apart

from stereo {2-channel) audio, these sig­
nals can also be 5.1-channel audio. A
large amount of audio information can be

recorded on the disc using this method.

Dolby Pro Logic

A surround system where a 4-channel
audio track is recorded as 2 channels and
then is restored to 4 channels for play. The
surround channel is monaural and can

reproduce up to 7 kHz.

DTS (Digital Theater Systems)

This is a method of coding digital signals

developed by Digital Theater Systems.
The signals are compressed at a low ratio

to maintain sound quality.

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.

Field

One frame is made up of 2 fields.
A regular television shows these fields one
after the other to create frames.

Frame

Frames are the still pictures that go

together to make a moving picture.
There are about 30 frames shown each

I second.

Frame still and field still

A stiii is shown when you pause a moving
picture.
A frame still is made up of 2 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 pic­
ture quality is lower.

1/P/B

MPEG 2, the video compression standard
adopted for use with DVDs, codes frames
using these 3 picture types.
I; Intra coded picture (l-picture)
This is the standard picture and is a com­
plete picture in itseif. This means it has the

best picture quality and is the best to use

when adjusting the picture.

P: Predictive coded picture (P-picture)

This picture is calculated based on past I

or P-pictures.
B: Bidirectionally-predictive coded picture

(B-picture)

This picture is caicuiated by comparing
past and future I and P-pictures so it has
the lowest volume of information.

Linear PCM (pulse code modulation)

PCM is the usuai digital method used for
music CDs. DVDs have a greater volume
so they use linear PCM, which has a high­
er sampling rate.

Playback control (PBC)

This method of controlling disc play is

included on version 2.0 Video CDs. You

are able to interact with the disc through

menus.

Title

This is the largest division on DVDs.

Track

This is the smallest division on Video CDs

and CDs and usually equates to a single
song.

RQT5931

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