Panasonic DVD-LA95 - Manuel (Page 44)

For Your Reference
44
RQT6025
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.
Direct navigator
This is a list of programs you have recorded.
You can select programs from the list to
view. The list also shows the date and time
of recording, the channel, and the titles of
titled programs. The selected program is
played in the background, making selection
even simpler.
Dolby Digital
This is a method of coding digital signals de-
veloped by Dolby Laboratories. Apart from
stereo (2-channel) audio, these signals 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 sur-
round channel is monaural and can repro-
duce up to 7 kHz.
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.
Frame still and field still
A still is shown when you pause a moving
picture. A frame still is made up of 2 alter-
nating 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
adopted for use with DVD-Video, codes
frames using these 3 picture types.
I: Intra coded picture (I-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 (P-picture)
This picture is calculated based on past I
or P-pictures.
B: Bidirectionally-predictive coded picture
(B-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)
PCM is the usual digital method used for
music CDs. DVDs have a greater volume so
they use linear PCM, which has a higher
sampling rate. Compressed PCM signals
are called packed PCM (PPCM).
MP3
A method of compressing audio, MPEG
Audio Layer 3 (MP3) allows audio to be
reduced to 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”
≥ To have this unit play files in a certain
order, prefix folder and file names with
numbers in the order you want to play
them. This may not work in all cases.
≥ This unit is compatible with multi-session
but if there are a lot of sessions it takes
more time for play to start. Keep the num-
ber of sessions to a minimum to avoid this.
Glossary