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About MP3/WMA/AAC
What is MP3?
MP3, whose official name is “MPEG-1 Audio Layer 3,” is a
compression standard prescribed by the ISO, the International
Standardization Organization and MPEG which is a joint activity
institution of the IEC.
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 and can achieve CD quality
sound with small file sizes.
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.
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-ROW 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.
CAUTION
Except for private use, duplicating audio data (including MP3/
WMA/AAC data) or distributing, transferring, or copying it,
whether for free or for a fee, without permission of the copyright
holder is strictly prohibited by the Copyright Act and by
international treaty.
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
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).