compression ratio TOYOTA tC 2013 Accessories, Audio & Navigation (in English)

6
6
• The folder selection sequence for playback
and other operations becomes the writing
sequence used by the writing software.
For this reason, the expected sequence at
the time of playback may not coincide with
the actual playback sequence. However,
there also is some writing software which
permits setting of the playback order.
IMPORTANT
When naming an MP3/ WMA
file, add the corresponding
filename extension (.mp3,
.wma).
This unit plays back files
with the filename extension
(.mp3, .wma) as an MP3/ WMA
file. To prevent noise and
malfunctions, do not use these
extensions for files other than
MP3/ WMA files.
•
•
MP3 additional
information
•
Files are compatible with the ID3 Tag Ver.
1.0, 1.1, 2.2, 2.3 and 2.4 formats for display
of album (disc title), track (track title), artist
(track artist) and comments. Ver. 2.x of ID3
Tag is given priority when both Ver. 1.x and
Ver. 2.x exist.
• The

emphasis function is valid only when
MP3 files of 32 kHz, 44.1 kHz and 48 kHz
frequencies are played back. (16 kHz,
22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz,
48 kHz sampling frequencies can be played
back.)
• There is no m3u playlist compatibilit

y.
• There is no compatibility with the MP3i
(MP3 interactive) or mp3 PRO formats.
• The sound quality of MP3 files generally
becomes bet

ter with an increased bit
rates. This unit can play recordings with
bit rates from 8 kbps to 320 kbps, but
in order to be able to enjoy sound of a
cert

ain quality, we recommend using only
discs recorded with a bit rate of at least
128 kbps.
MP3 and WMA files
• MP3 is short for MPEG Audio Layer 3 and
refers to an audio compression technology
standard.
• WMA is short for Windows Media™
Audio and refers to an audio compression
technology that is developed by Microsoft
Corporation. WMA data can be encoded by
using Windows Media Player.
• With some applications used to encode
WMA files, this unit may not operate cor-
rectly.
• With some applications used to encode
WMA files, album names and other text
information may not be correctly displayed.
• This unit allows playback of MP3/WMA files
on CD-ROM, CD-R, CD-RW discs and USB
portable audio player/USB memory. Disc
recordings compatible with level 1 and level
2 of ISO9660 and with the Romeo and Joliet
file system can be played back.
• MP3/WMA files are not compatible with
packet write data transfer.
• The maximum number of characters which
can be displayed for a file name, including
the extension (.mp3, .wma), is 32, from
the first character.
• The maximum number of characters whic

h
can be displayed for a folder name is 32.
• In case of files recorded according to the
Romeo file system, only the first 32 c

har-
acters can be displayed.

67
67
Terms
Packet writeThis is a general term for a method
of writing on CD -R, etc. at the time
required for a file, just as is done
with files on floppy or hard discs.
Bit rateThis expresses data volume per
second, or bps (bits per second)
units. The higher the rate, the more
information is available to reproduce
the sound. Using the same encoding
method (such as MP3), the higher
the rate, the better the sound.
Multi-sessionMulti-session is a recording method
that allows additional data to be
recorded later. When recording
data on a CD -ROM, CD -R or CD -
RW, etc., all data from beginning
to end is treated as a single unit or
session. Multi-session is a method
of recording more than 2 sessions in
one disc.
CD-DACD - DA is an abbreviation of
Compact Disc Digital Audio. It refers
to the uncompressed format of
regular CDs.
ID3 TagThis is a method of embedding track-
related information in a 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
characters, the information can be
viewed when the track is played back.
ISO9660 formatThis is the international standard
for the format logic of CD -ROM
folders and files. For the ISO9660
format, there are regulations for the
following two levels.
Level 1:
The file name is in 8.3 format (the
name consists of up to 8 characters,
half-byte English capital letters
and half-byte numerals and the "_"
sign, with a file- extension of three
characters).
Level 2:
The file name can have up to 31
characters (including the separation
mark "." and a file extension).
Each folder contains less than 8
hierarchies.
Extended formats
Joliet:
File names can have up to 64
characters.Romeo:
File names can have up to 128
charac
ters.
m3uPlaylists created using the
" WINAMP " software have a playlist
file extension (.m3u).
MP3MP3 is short for MPEG1 & 2 Audio
Layer3. It is an audio compression
standard set by a working group
(MPEG) of the ISO (International
Standards Organization). MP3 is able
to compress audio data to about 1/10
the level of a conventional disc.
WMAWMA is short for Windows MediaTM
Audio and refers to an audio
compression technology that is
developed by Microsoft Corporation.
WMA data can be encoded by using
Windows Media Player version 7 or
later.