About Mp3 Files - Sony CDX-757MX Xplod Service Manual

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TEST DISC
This set can playback a CD-R, CD-RW for audio use. When test
this set, use the following test disc.
Test disc for CD-R: TCD-R082LMT (Part No.: J-2502-063-1)
Test disc for CD-RW: TCD-W082L (Part No.: J-2502-063-2)
Notes on CD-R/CD-RW discs
• You can play CD-Rs/CD-RWs (recordable CDs/rewritable CDs) on
this unit (fig. E).
• Some CD-Rs/CD-RWs (depending on the equipment used for its
recording or the condition of the disc) may not play on this unit.
• You cannot play a CD-R/CD-RW that is not finalized*.
• A CD-R/CD-RW to which a session can be added can be played.
* A process necessary for a recorded CD-R/CD-RW disc to be played
on the audio CD player.
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Audio CD
MP3 files
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About MP3 files

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Folder (album)
MP3 file (track)
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MP3 (MPEG 1 Audio Layer-3) is a standard technology and format for
compressing a sound sequence. The file is compressed to about 1/10 of its
original size. Sounds outside the range of human hearing are compressed
while the sounds we can hear are not compressed.
Notes on discs
You can play MP3 files recorded on CD-ROMs, CD-Rs (recordable CDs),
and CD-RWs (rewritable CDs). The disc must be in the ISO 9660*
level 2 format, or Joliet or Romeo in the expansion format. You can use a
disc recorded in Multi Session* 2
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* ISO 9660 Format
The most common international standard for the logical format of files
and folders on a CD-ROM.
There are several specification levels. In Level 1, file names must be in
the 8.3 format (no more than eight characters in the name, no more than
three characters in the extension ".MP3") and in capital letters. Folder
names can be no longer than eight characters. There can be no more
than eight nested folder levels.
In level 2, file names can be up to 31 characters long (including the
delimiter, the dot ".", and the extension ". MP3"). Each folder can have
up to 8 trees.
For Joliet or Romeo in the expansion format, make sure of the contents
of the writing software, etc.
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* Multi Session
This is a recording method that enables adding of data using the Track-
At-Once method. Conventional CDs begin at a CD control area called
the Lead-in and end at an area called Lead-out. A Multi Session CD is a
CD having multiple sessions, with each segment from Lead-in to Lead-
out regarded as a single session.
CD-Extra: A format that contains audio tracks (audio CD data) in
Session 1, and a data track in Session 2.
Mixed CD: A format that contains a data track and audio tracks (audio
CD data) in a session.
Notes
• If MP3 files and Audio data are mixed in a disc, the first identified
file or data will be played back.
• With formats other than ISO 9660 level 1, folder names or file
names may not be displayed correctly.
• When naming, be sure to add the file extension ".MP3" to the file
name.
• If you put the extension ".MP3" to a file other than MP3, the unit
cannot recognize the file properly and will generate random noise
that could damage your speakers.
The playback order of the MP3 files
The playback order of the folders and files is shown in the illustration
above.
Notes
• A folder that does not include an MP3 file is skipped.
• If you playback an MP3 file before the information on all the CDs
in the disc magazine has been read, and then set the ignition to
OFF or select another source, the beginning of the current track
may play back when you resume playback.
• The unit reads the disc information (the number of folders and
files, or the location of the data) before playback of an MP3 file. It
may take more time to start playback of a disc with a complex file
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structure.
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• When a disc magazine is inserted into the CD changer or the reset
button of the connected car audio is pressed, the unit will
automatically be activated and read the information on the CDs.
When the information on all the CDs in the disc magazine has
been read, the unit will automatically stop operation. The unit
firstly reads all of the disc information in the disc magazine.
Depending on the recording method, it may take some time to
stop the operation even if you set the ignition key to OFF during
disc reading. This is not a malfunction.
• The following discs take a longer time to start playback.
– a disc recorded with complicated tree structure.
– a disc recorded in Multi Session.
– a disc to which data can be added.
We recommend that you make only one or two trees for each disc.
• Depending on the condition of the disc, it may not play back. For
details, please refer to "Notes on discs."
• Maximum folder number in a disc: 255* (including root folder and
empty folders)
• Maximum file number in a disc: 511*
* Maximum number of files and folders: 512
When a file/folder name contains many characters, this number
may become less than 512.
Cautions when playing a disc that is recorded in Multi Session
• When the first track of the first session is audio CD data: Non-music data
information (track number, time, etc.) is displayed with no sound.
• When the first track of the first session is not audio CD data:
– Audio CD data is played back normally; other data is played back with
no sound. (MP3 file(s) cannot be played back.)
– If no MP3 file is in the disc, "NO Music" is displayed and nothing is
played back. (Audio CD data is not recognized.)
Note on character codes
Character codes vary depending on the master unit.
For details, refer to the operating instructions for the master unit.
Note on display of playing time
In the following cases, elapsed playing time may not be displayed
accurately.
– when an MP3 file of VBR (variable bit rate) is played.
– during fast-forward/reverse.
Tip
• To specify a desired playback order, before the folder or file
name, input the order by number (e.g., "01," "02"), then record
contents onto a disc. (The order differs depending on the writing
software.)
• A disc/album/track name or track number that is over 99 may not
be displayed accurately when this unit is connected to a master
unit that does not support MP3. A master unit that supports MP3
is recommended.
About ID3 tag version 2
Although not a malfunction, the following occurs when
an MP3 file containing ID3 tag ver.2 is played:
– When skipping a portion of ID3 tag ver.2 (at the
beginning of the track), sound is not output.
Skip time changes depending ID3 tag ver.2 capacity.
Example: At 64 kbytes, it is about 2 seconds
co
(with RealJukebox).
– The displayed elapsed playing time when skipping a
portion of ID3 tag ver.2 is inaccurate.
For MP3 files of a bit rate other than 128 kbps, time is
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not displayed accurately during playback.
– When an MP3 file is created with MP3 conversion
software (ex. RealJukebox*), ID3 tag ver.2 will
automatically be written.
* "RealJukebox is a registered trademark of
RealNetworks, Inc."
As of December, 2001
CDX-757MX
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