compression ratio Lexus IS220d 2012 Navigation manual

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1. AUDIO/VIDEO SYSTEM OPERATION
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DVD video discs: Digital Versatile Disc
that holds video. DVD video discs have
adopted “MPEG2”, one of the world
standards of digital compression tech-
nologies. The picture data is com-
pressed by 1/40 on average and stored.
Variable rate encoded technology in
which the volume of data assigned to the
picture is changed depending on the pic-
ture format has also been adopted. Au-
dio data is stored using PCM and Dolby
Digital, which enables higher quality of
sound. Furthermore, multi-angle and
multi-language features will also help
users enjoy the more advanced technol-
ogy of DVD video.
Viewer restrictions: This feature limits
what can be viewed in conformity with
a level of restrictions of the country. The
level of restrictions varies depending on
the DVD video disc. Some DVD video
discs cannot be played at all, or violent
scenes are skipped or replaced with oth-
er scenes.
• Level 1: DVD video discs for children
can be played.
• Level 2 - 7: DVD video discs for chil-
dren and G-rated movie can be
played.
• Level 8: All types of the DVD video
discs can be played.
Multi-angle feature: The same scene
can be enjoyed from different angles.
Multi-language feature: The subtitle and
audio language can be selected.
Region codes: The region codes are pro-
vided on DVD players and DVD discs.
If the DVD video disc does not have the
same region code as the DVD player,
you cannot play the disc on the DVD
player. For region codes, see page 229.
Audio: This DVD player can play liner
PCM, Dolby Digital and MPEG audio
format DVDs. Other decoded types can-
not be played.
Title and chapter: Video and audio pro-
grams stored in DVD video discs are di-
vided into parts by title and chapter.
Title: The largest unit of the video and
audio programs stored on DVD video
discs. Usually, one movie, one album,
or one audio program is assigned as a ti-
tle.
Chapter: A unit smaller than that of title.
A title comprises of several chapters.DVD VIDEO DISC
GLOSSARY
Manufactured under license from
Dolby Laboratories. Dolby and the
double-D symbol are trademarks of
Dolby Laboratories.

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1. AUDIO/VIDEO SYSTEM OPERATION
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Handle discs carefully, especially when
inserting them. Hold them on the edge
and do not bend them. Avoid getting
fingerprints on them, particularly on the
shiny side.
Dirt, scratches, warping, pin holes or
other disc damage could cause the
player to skip or to repeat a section of a
track. (To see a pin hole, hold the disc
up to the light.)
Remove discs from the players when
not in use. Store them in their plastic
cases away from moisture, heat and
direct sunlight.
To clean a disc: Wipe it with a soft, lint-
free cloth that has been dampened with
water. Wipe in a straight line from the
centre to the edge of the disc (not in cir-
cles). Dry it with another soft, lint-free
cloth. Do not use a conventional record
cleaner or anti-static device.
MP3 (MPEG Audio Layer 3) and
WMA (Windows Media Audio) are
audio compression standards.
The MP3/WMA player can play MP3
and WMA files on CD-ROM, CD-R
and CD-RW discs.
The unit can play disc recordings com-
patible with ISO 9660 level 1 and level
2 and with the Romeo and Joliet file
system.
When naming an MP3 or WMA file,
add the appropriate file extension (.mp3
or .wma).
The MP3/WMA player plays back files
with .mp3 or .wma file extensions as
MP3 or WMA files. To prevent noise
and playback errors, use the appropriate
file extensions.
The MP3/WMA player can play only
the first session when using multi-ses-
sion compatible CDs.
NOTICE
Do not use special shaped, transpar-
ent/translucent, low quality or labeled
discs such as those shown in the illus-
trations. The use of such discs may
damage the player, or it may be
impossible to eject the disc.
This system is not designed for use of
Dual Discs. Do not use Dual Discs
because they may cause damage to
the player.
Do not use discs with a protection
ring. The use of such discs may dam-
age the player, or it may be impossi-
ble to eject the disc.
CorrectWrong
MP3/WMA FILES

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1. AUDIO/VIDEO SYSTEM OPERATION
5
AUDIO/VIDEO SYSTEM
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CD-R/CD-RW discs may be damaged
by direct exposure to sunlight, high
temperatures or other storage condi-
tions. The unit may be unable to play
some damaged discs.
If you insert a CD-RW disc into the
MP3/WMA player, playback will begin
more slowly than with a conventional
CD or CD-R disc.
Recordings on CD-R/CD-RW cannot
be played using the DDCD (Double
Density CD) system.
This is a general term that describes the
process of writing data on-demand to
CD-R, etc., in the same way that data is
written to floppy or hard discs.
This is a method of embedding track-
related information in an MP3 file. This
embedded information can include the
track title, the artist’s name, the album
title, the music genre, the year of pro-
duction, comments and other data. The
contents can be freely edited using soft-
ware with ID3 tag editing functions.
Although the tags are restricted to a
number of characters, the information
can be viewed when the track is played
back.
WMA files can contain a WMA tag
that is used in the same way as an ID3
tag. WMA tags carry information such
as track title and artist name.This is the international standard for the
formatting of CD-ROM folders and
files. For the ISO 9660 format, there
are 2 levels of regulations.
Level 1: The file name is in 8.3 format
(8 character file names, with a 3 charac-
ter file extension. File names must be
composed of one-byte capital letters
and numbers. The “_” symbol may also
be included.)
Level 2: The file name can have up to
31 characters (including the separation
mark “.” and file extension). Each
folder must contain fewer than 8 hierar-
chies.
Playlists created using “WINAMP”
software have a playlist file extension
(.m3u).
MP3 is an audio compression standard
determined by a working group
(MPEG) of the ISO (International Stan-
dard Organization). MP3 compresses
audio data to about 1/10 the size of that
on conventional discs.
WMA (Windows Media Audio) is an
audio compression format developed
by Microsoft
®. It compresses files into
a size smaller than that of MP3 files.
The decoding formats for WMA files
are Ver. 7, 8 and 9.
TERMS
PACKET WRITE
ID3 TAG
WMA TAG
ISO 9660 FORMAT
m3u
MP3
WMA