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MP3 files contain compressed audio data. MP3 encoding is capable of
compressing audio data at extremely high ratios, reducing the size of
music files to as much as one-tenth their original size. This is achieved
while still maintaining near CD quality. The MP3 format realises such
high compression ratios by eliminating the sounds that are either
inaudible to the human ear or masked by other sounds.
What is WMA?
WMA, or “Windows Media
™
Audio,” is compressed audio data.
WMA is similar to MP3 audio data.
What is AAC?
AAC is the abbreviation for “Advanced Audio Coding,” and is a basic
format of audio compression used by MPEG2 or MPEG4.
Method for creating MP3/WMA/AAC files
Audio data is compressed using software with MP3/WMA/AAC codecs.
For details on creating MP3/WMA/AAC files, refer to the user’s manual
for that software.
MP3/WMA/AAC files that are playable on this device have the file
extensions “mp3” / “wma” / “m4a”. Files with no extension cannot be
played back (WMA ver. 7.1, 8 and 9 are supported). Protected files are
not supported, neither are raw AAC files (using the “.aac” extension).
There are many different versions of the AAC format. Confirm that the
software being used conforms to the acceptable formats listed above.
It’s possible that the format may be unplayable even though the
extension is valid.
Playback of AAC files encoded by iTunes is supported.
Supported playback sampling rates and bit rates
MP3
WMA
AAC
This device may not play back correctly depending on sampling rates.
ID3 tags/WMA tags
This device supports ID3 tag v1 and v2, and WMA tag.
If tag data is in an MP3/WMA/AAC file, this device can display the title
(track title), artist name, and album name ID3 tag/WMA tag data.
This device can only display single-byte alphanumeric characters (up to
30 for ID3 tags and up to 15 for WMA tags) and the underscore. For
non-supported characters, “NO SUPPORT” is displayed.
If information contains characters other than ID3 tag information, the
audio file may not be played back.
The tag information may not be correctly displayed, depending on the
contents.
Producing MP3/WMA/AAC discs
MP3/WMA/AAC files are prepared, then written to a CD-R or CD-RW
using CD-R writing software. A disc can hold up to 510 files/folders
(including Root Folders), and the maximum number of folders is 255.
Playback may not be performed if a disc exceeds the limitations
described above.
Media supported
The media that this device can play back are CD-ROMs, CD-Rs, and
CD-RWs.
Corresponding File Systems
This device supports discs formatted with ISO9660 Level 1 or Level 2.
Under the ISO9660 standard, there are some restrictions to remember.
The maximum nested folder depth is 8 (including the root directory).
The number of characters for a folder/file name is limited.
Valid characters for folder/file names are letters A-Z (all caps), numbers
0-9, and ‘_’ (underscore).
This device also can play back discs in Joliet, Romeo, etc., and other
standards that conform to ISO9660. However, sometimes the file
names, folder names, etc., are not displayed correctly.
Formats supported
This device supports CD-ROM XA, Mixed Mode CD, Enhanced CD
(CD-Extra) and Multi-Session.
This device cannot correctly play back discs recorded with Track At
Once or packet writing.
Order of files
Files are played back in the order that the writing software writes them
to the disc. Therefore, the playback order may not be what is expected.
Verify the writing order in the software’s documentation. The playback
order of the folders and files is as follows.
*
The folder No./ folder Name will not be displayed if no readable file is
contained in the folder.
Bit rate
This is the “sound” compression rate specified for encoding. The higher
the bit rate, the higher the sound quality, but also the larger the files.
Sampling rate
This value shows how many times per second the data is sampled
(recorded). For example, music CDs use a sampling rate of 44.1 kHz, so
the sound is sampled (recorded) 44,100 times per second. The higher
the sampling rate, the higher the sound quality, but also the larger the
volume of data.
Encoding
Converting music CDs, WAVE (AIFF) files, and other sound files into the
specified audio compression format.
Tag
Song information such as track titles, artist names, album names, etc.,
written into MP3/WMA/AAC files.
Root folder
The root folder (or root directory) is found at the top of the file system.
The root folder contains all folders and files. It is created automatically
for all burned discs.
Sampling rates:
48 kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz, 16 kHz,
12 kHz, 11.025 kHz, 8 kHz
Bit rates:
8 - 320 kbps
Sampling rates:
48 kHz, 44.1 kHz, 32 kHz
Bit rates:
48 - 192 kbps
Sampling rates:
48 kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz, 16 kHz,
12 kHz, 11.025 kHz, 8 kHz
Bit rates:
16 - 320 kbps
Terminology
Root folder
Folder
MP3/WMA/AAC File
00ALPINE.book Page 11 Sunday, November 20, 2011 6:35 PM
