Panasonic DVD-LV50 Manuel D'utilisation page 33

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.
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 devel-
oped by Dolby Laboratories. Apart from stereo
(2-channel) audio, these signals can also be
multi-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 re-
stored to 4 channels for play. The surround chan-
nel is monaural and can reproduce up to 7 kHz.
DTS (Digital Theater Systems)
This surround system is used in many movie the-
aters 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.
Apparatus Claims of U.S. Patent Nos. 4,631,603, 4,577,216, and 4,819,098, licensed for
limited viewing uses only.
This product incorporates copyright protection technology that is protected by method claims
of certain U.S. patents and other intellectual property rights owned by Macrovision Corporation
and other rights owners. Use of this copyright protection technology must be authorized by
Macrovision Corporation, and is intended for home and other limited viewing uses only unless
otherwise authorized by Macrovision Corporation. Reverse engineering or disassembly is
prohibited.
Frame still and field still
A still 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 picture quality is
lower.
I/P/B
MPEG 2, the video compression standard adopt-
ed for use with DVD-Video, codes frames using
these 3 picture types.
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: Bidirectionally-predictive coded picture
This picture is calculated by comparing past
and future I and P-pictures so it has the
lowest volume of information.
Linear PCM (pulse code modulation)
These are uncompressed digital signals, similar
to those found on CDs.
Playback control (PBC)
If a Video CD has playback control, you can
select scenes and information with menus.
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