compression ratio TOYOTA tC 2011 Accessories, Audio & Navigation (in English)

AUDIO/VIDEO SYSTEM
260
V573_E
MP3/WMA files
z MP3 (MPEG Audio Layer 3) and
WMA (Windows Media Audio) are
audio compression standards.
z The MP3/W MA player can play MP3
and WMA files on CD-R and CD-RW
discs.
The unit can play disc recordings
compatible with ISO 9660 level 1
and level 2 and with the Romeo and
Joliet file system.
z The USB player can play MP3 and
WMA files on USB memory device.
z When naming an MP3 or WMA file,
add the appropriate file extension
(.mp3 or .wma).
z The MP3/W MA player and USB
player play back files with .mp3
or .wma file extensions as MP3 or
WMA files. To prevent noise and
playback errors, use the appropriate
file extensions.
z The player can play only the first
session using multi-session com-
patible CDs.
z MP3 files are compatible with the
ID3 Tag Ver. 1.0, Ver. 1.1, Ver. 2.2,
Ver. 2.3 and Ver. 2.4 formats. The
unit cannot display disc title, track ti-
tle, artist name, and so on in other
formats.
z WMA files can contain a WMA tag
that is used in the same way as an
ID3 tag. WMA tags carry informa-
tion such as track title, artist name.
z The emphasis function is available
only when playing MP3/W MA files
recorded at 22.05, 32, 44.1 and 48
kHz. (The system can play MP3
files with sampling frequencies of 8,
11.025, 12, 16 and 24 kHz. How-
ever, the emphasis function is not
available for files recorded at these
frequencies.)
z The sound quality of MP3/W MA files
generally improves with higher bit
rates. In order to achieve a rea-
sonable level of sound quality, discs
and USB memory device recorded
with a bit rate of at least 128 kbps
are recommended. Playable bit rates
MP3 files:
MPEG1 LAYER3—32 to 320 kbps
MPEG2 LAYER3—8 to 160 kbps
MPEG2.5 LAYER3—8 to 160 kbps
WMA files:
Ver. 7, 8, 9—32 to 320 kbps
z The MP3/W MA player does not play
back MP3/W MA files from discs re-
corder using packet write data
transfer (UDF format). Discs
should be recorded using
“pre-mastering” software rather than
packet-write software.
z The m3u playlists are not compatible
with the audio player.
z MP3i (MP3 interactive) and
MP3PRO formats are not compatible
with the audio player.
z The MP3 player is compatible with
VBR (Variable Bit Rate).
z When playing back files recorded as
VBR (Variable Bit Rate) files, the
play time will not be correctly dis-
played if fast-forward or reverse op-
erations are used.
z It is not possible to check folders
that do not include MP3/W MA files.
z MP3/W MA files in folders up to 8
levels deep can be played. How-
ever, the start of playback may be
delayed when using discs containing
numerous levels of folders. For this
reason, we recommend creating
discs and USB memory device with
no more than two levels of folders.
z It is possible to play up to 255 fold-
ers or 999 files on one disc and USB
memory device.

AUDIO/VIDEO SYSTEM
267
V573_E

TERMS
Packet write—
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.
ID3 Tag—
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 production,
comments and other data. The contents
can be freely edited using software with
ID3 tag editing functions. Although the
tags are restricted to the number of char-
acters, the information can be viewed
when the track is played back.
WMA Tag—
WMA files can contain a W MA tag that is
used in the same way as an ID3 tag.
WMA tags carry information such as track
title, artist name.
ISO 9660 format—
This is the international standard for the
formatting of CD-ROM folders and files.
For the ISO 9660 format, there are two
levels of regulations.
Level 1:
The file name is in 8.3 format (8 character
file names, with a 3 character 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 charac-
ters (including the separation mark “.” and
file extension). Each folder must contain
fewer than 8 hierarchies.
m3u—
Playlists created using “WINAMP” software
have a playlist file extension (.m3u). MP3—
MP3 is an audio compression standard
determined by a working group (MPEG) of
the ISO (International Standard Organiza-
tion). MP3 compresses audio data to
about 1/10 the size of that on conventional
discs.
WMA—
WMA (Windows Media Audio) is an audio
compression format developed by Micro-
soft. It compresses files into a size
smaller than that of MP3 files. The de-
coding formats for W MA files are Ver. 7, 8,
and 9.