SONY CDX757MX
Manual de Servicio

CDX-757MX

FAQ- about MP3 Audio File
Q1 What is MP3?
MP3 (MPEG Audio Layer3) is a standard for compressing audio parts of Moving Pictures Experts Group (MPEG). The special feature of MP3 is that the music data is compressed to about 1/10 of its original size while retaining the same sound quality as a CD or an MD. Compared with an audio disc (maximum 74 minutes running time), MP3 lets you compress about 10 audio discs or 160 fourminute songs into a CD-R/RW of 650MB.
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Q4

Can the unit play a data CD with folder levels?
The unit can play a data CD with folder levels.

Q5

Is there any restriction about the bit rate regarding playback of MP3 files?
There is no specific restriction, but a bit rate of more than 128kbps is recommended from the perspective of sound quality. The unit also supports VBR (Variable Bit Rate).
Note Elapsed playing time may not be displayed accurately during cue/reverse.

Q14 Is a file name/a folder name of MP3 different from the name when creating a data CD (the name displayed on your computer)?
On this unit, a file name/a folder name is displayed as below. � A file name/a folder name can be displayed up to 8 characters. A 9th or later character cannot be displayed or scrolled. � A folder name or a file name in a format other than ISO 9660 level 1 may not be displayed correctly. The file name should only use one byte uppercase, one byte numeric characters, or an underscore (�__�). It should also be no more than 8 characters long, and with no more than three characters in the extension. � Japanese phonetic symbols/ Chinese characters cannot be displayed. Only one byte uppercase (A-Z), one byte numeric character (0-9), and one byte symbol (�_�, �.�, �<�, �>�, �/�, �+�, �*�) can be displayed. One byte lowercase (az) is changed to an uppercase character, and any other characters are displayed as �*�.

Note Recorded music is limited to private use only. Use of music beyond this limit requires the permission of the copyright holders. Copyright law prohibits copying, distributing, or delivering all or part of the contents.

Q6

Does the unit support a disk of 80 minutes running time (700 MB data capacity)?
The unit supports a disk of 80 minutes running time (700 MB data capacity).

Q2

What kind of MP3 files can be played back?
MP3 files in CD-ROMs, CD-Rs, and CDRWs can be played. Pay attention to the following points when creating MP3 data CDs using your computer, CD-R/RW drive, writing software, or MP3 file. � The file must be in the ISO 9660 level 1 or level 2 format, or Joliet or Romeo in the ISO 9660 expansion format. A folder name or a file name with the format other than ISO 9660 level 1 may not be displayed correctly. When creating MP3 data CDs, the format of ISO 9660 level 1 is recommended. � When naming, be sure to add the file extension �.MP3� to the MP3 file name. The unit cannot recognize an MP3 file without the extension �.MP3,� or a file that is not MP3 format, even with the extension �.MP3.�

Q7

Can the unit play a CD-R/RW containing both music CD data (CD-DA) and MP3 file data?
The first identified file or data will be played back.

Q8

Can the unit play a disc to which data can be added (non-finalized disc)?
The unit can play a non-finalized disc.

Q15 MP3 files recorded onto a CD-R/ RW cannot be played.
This may happen in following cases. � The recording method onto CD-R/RW is the packet write method. � The extension file is not an �.MP3.� � The file data is not MP3 format. � Some recording condition (omission of data, etc.) or some disc condition (dirt, crack, curving, etc.) may cause inability to playback an MP3 file.

Q9

Can the unit play a Multi Session disc?
The unit can play a Multi Session disc. For details, refer to the operating instructions.

Q10 Does the unit support Emphasis?
The unit does not support Emphasis.

Q16 It takes some time to start playback of MP3 file.
The unit reads the disc information (the number of folders and files, or the location of the data) before playback of MP3 file. It may take more time to start playback of a disc with many trees. Please refer to the instruction manual for details.

Q3

Is there maximum number of folders or files to play?
Pay attention to the maximum numbers mentioned below. � 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. � The maximum number of trees which can be played is 8. The unit allows you to change the folders, to play just the files in your favorite folder repeatedly, or to play files randomly, create folders according to artist name or album, and put related MP3 files into folders to use the unit as a CD changer.

Q11 What is the sampling rate supporting the unit?
The unit is supported from 16kHz to 48kHZ.
MPEG1 MPEG2 48kHz 24kHz 44.1kHz 22.05kHz 32kHz 16kHz

Q12 Does the unit support the play list of m3u?
The unit does not support the play list of m3u.

Q17 Playback skipping and no playback occur.
Recording condition onto CD-R/RW (omission of data, etc.) or disc condition (dirt, crack, curving, etc.) may cause playback skipping or no playback.

Q13 Does the unit support ID3-Tag?
The unit supports ID3 tag ver.1. Pay attention to the following points about ID3 tag ver.2.
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 (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 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

Q18 Can WAVE files be played back on this unit?
WAVE files cannot be played back on this unit.

Q19 Can other compressed formats, such as ATRAC3, be played back on the unit?
Only MP3 can be played back on the unit.

ROOT 01_ ALBUM

: Folder : MP3 file 001TRACK.MP3 002TRACK.MP3 010TRACK.MP3
02_ ALBUM

011TRACK.MP3 020TRACK.MP3
10_ ALBUM

091TRACK.MP3 100TRACK.MP3

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