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RQTV0115
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Glossary
Audio channel for DVD (ch)
Sound is divided into channels based on the sound’s role.
Example: 5.1 channel
≥Front speakers— 1 left channel and 1 right channel
≥Center speaker— 1 channel
≥Surround speakers— 1 left channel and 1 right channel
≥Subwoofer— 1 channel a0.1
(the ratio of bass to the total amount
of sound output)
The following are indicated on the On-Screen Menu Icons.
Example:
(1) .1: Subwoofer signal
(not displayed if there is no subwoofer signal)
(2) 0: No surround
1: Mono surround
2: Stereo surround (left/right)
(3) 1: Center
2: Front leftiFront right
3: Front leftiFront rightiCenter
Bitstream
Digitized and compressed audio signal.
It is decoded by decoders into multi-channel audio signals, such as
5.1 channels.
Decoder
This device restores the coded audio signals on DVDs to normal.
This is called decoding.
DivX
DivX is a popular media technology created by DivX, Inc. DivX media
files contain highly compressed video with high visual quality that
maintains a relatively small file size.
Dolby Digital
This is a method of coding digital signals developed by Dolby
Laboratories. Apart from stereo (2-channel) audio, these signals are
also compatible with 5.1-channel audio. A large amount of audio
information can be recorded on one 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.
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.
Film and video
DVD-Videos are recorded using either film or video. This unit can
determine which type has been used, then uses the most suitable
method of progressive output.
Film: Recorded at 25 frames per second (PAL discs) or 24 frames
per second (NTSC discs). (NTSC discs recorded at 30
frames per second as well). Generally appropriate for motion
picture films.
Video: Recorded at 25 frames/50 fields per second (PAL discs) or
30 frames/60 fields per second (NTSC discs). Generally
appropriate for TV drama programs or animation.
Frame and field
Frames are the still pictures that go together to make a moving
picture. A frame is made up of 2 fields.
≥A frame still is made up of two alternating fields so the picture may
appear blurred but the overall quality is high.
≥A field still is not blur, but it has only half the information of a frame
still so picture quality is lower.
ID3 tag
MP3 file that has an area in which the character-based information
referred to as ID3 tag, is stored. The information of the track, such as
the title, artist name, etc. can be stored here. The information can be
displayed on players supporting the ID3 tag when a track is played
back. However, this unit cannot because it does not support the ID3
tag.
Interlace and progressive output
The NTSC video signal standard has 480 interlaced (i) scan lines,
whereas progressive scanning uses twice the number of scan lines.
This is called 480p.
I/P/B
The DVD recording system shares the data commonly used by
screens and uses screen-independent data individually for each
screen to store the data on the disc efficiently.
≥I-picture (Intra coded picture):
A frame recorded independently as reference for commonly used
data.
≥P-picture (Predictive coded picture):
This picture is calculated based on past I- or P-pictures.
≥B-picture (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.
I-picture has the best quality and is the best to use when adjusting
the picture.
Linear PCM (Pulse Code Modulation)
These are uncompressed digital signals, similar to those found on
CDs.
MP3 (MPEG Audio Layer 3)
An audio compression method that compresses audio to
approximately one-tenth of its size without any considerable loss of
audio quality.
MPEG4
A compression system for use on mobile devices or a network, that
allows highly efficient recording at a low bit rate. Recorded with the
Panasonic SD multi cameras or DVD recorders and plays.
Multi-session
≥This means recording data onto a CD-R/RW disc several times.
“Read-in/Programme area/Read-out” of the data on a disc makes
one session.
≥If data, such as music, is added onto a pre-recorded CD-R/RW
disc, a new session will be added. Such a disc is referred to as a
multisession disc.
≥Normal audio CD players can playback only the first session. On
the other hand, this unit can playback 2 or more sessions.
Playback control (PBC)
≥If a Video CD has playback control, you can select scenes and
information with menus.
≥In this manual, playing back of the contents of a Video CD using
the menu screen is referred to as “Menu play” for Video CD.
Sampling frequencies
Sampling is the process of converting the heights of sound wave
(analogue signal) samples taken at set periods into digits (digital
encoding). Sampling frequency is the number of samples taken per
second, so larger numbers mean more faithful reproduction of the
original sound.
WMA (Windows Media Audio Picture)
WMA is a compression format developed by Microsoft Corporation.
It achieves the same sound quality as MP3 with a file size that is
smaller than that of MP3.
3/2 .1 ch
Frame
Field Field
=
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VP60GCS.book Page 42 Monday, March 6, 2006 3:23 PM