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OTHER CONTROLS AND EQUIPMENT
Notes on MP3/WMA/AAC
What is MP3?
• MP3 (MPEG audio layer3) is an audio
compression format that has become
the standard format among PC users. Its
merit is that the original audio data is
compressed to approximately 1/10 and
high sound quality is maintained. This
means that it is possible to store the data
of approximately 10 music CDs on a single CD-R/RW disc, which in turn makes
it possible to play music for a long time
without having to change the disc.
What is WMA?
• An abbreviation of “Windows Media
Audio,” WMA is an audio compression
format developed by Microsoft.
• WMA files for which the DRM (Digital
Rights Management) function is ON cannot be played.
• Windows MediaTM and the Windows®
logo are trademarks or registered trademarks of Microsoft Corporation in the
United States and other countries.
What is AAC?
• An abbreviation of “Advanced Audio
Coding,” AAC is an audio compression
format used by MPEG2 and MPEG4.
Points to remember when making MP3/
WMA/AAC files
Common
• High bit rate and high sampling frequency are recommended for high quality sounds.
• Selecting VBR (Variable Bit Rate) is not
recommended. Selecting VBR may
cause display of incorrect playing time
and jumpiness of playback.
• Playback sound quality varies depending
on the encoding environment. For
details, refer to the user manual of the
encoding software and the writing software in use.
NOTICE
Never assign the “.mp3”, “.wma”, or
“.m4a” file name extension to a file if
it is not in the MP3/WMA/AAC format
file. Failure to observe this may result
in damage to the speaker due to
noise production.
Recording MP3/WMA/AAC files on a CD
media
• It is recommended not to write both CDDA files and MP3/WMA/AAC files on a
disc.
• If both CD-DA files and MP3/WMA/AAC
files are on the same disc, tracks may
not be played in the correct order or
some tracks may not be played at all.
• When storing both MP3 data and WMA
data on the same disc, sort and place
them in different folders.
• Do not write files other than MP3/WMA/
AAC files and unnecessary folders on a
disc.
• MP3/WMA/AAC files should be named
to meet the standards and the file system specifications as shown below.
• The file extension “.mp3”, “.wma” or
“.m4a” should be assigned to files based
on their format independently.
• You may encounter a trouble in playing
MP3/WMA/AAC files or displaying information of MP3/WMA/AAC files depending on the writing software or CD
recorder in use.
• This unit does not have a play list function.
• It is recommended to write discs in Discat-Once mode even though Multi-session mode is supported.
Compression formats
MP3
• Bit rate:
MPEG1 Audio Layer III: 32 k - 320 kbps
MPEG2 Audio Layer III: 8 k - 160 kbps
MPEG2.5 Audio Layer III: 8 k - 160 kbps
• Sampling frequency:
MPEG1 Audio Layer III: 32 k/44.1 k/
48 kHz
MPEG2 Audio Layer III: 16 k/22.05 k/
24 kHz
MPEG2.5 Audio Layer III: 8 k/11.025 k/
12 kHz
5-68
79MH0-74E