5-40
79MH0-74E
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 fre-
quency are recommended for high qual-
ity 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 depend-
ing on the encoding environment. For
details, refer to the user manual of the
encoding software and the writing soft-
ware in use.
Recording MP3/WMA/AAC files on a CD
media
• It is recommended not to write both CD-
DA 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 sys-
tem 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 infor-
mation of MP3/WMA/AAC files depend-
ing on the writing software or CD
recorder in use.
• This unit does not have a play list func-
tion.
• It is recommended to write discs in Disc-
at-Once mode even though Multi-ses-
sion 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
WMA (Ver. 7, Ver. 8, Ver. 9*)
• Bit rate: CBR 32 k - 320 kbps
• Sampling frequency: 32 k/44.1 k/48 kHz
* WMA 9 Professional/LossLess/Voice are
not supported.
AAC*
• Bit rate: ABR 16 k - 320 kbps
• Sampling frequency: 32 k/44.1 k/48 kHz
* Apple Lossless is not supported.
Supported file systems
ISO 9660 Level 1/Level 2, Joliet, Romeo
Maximum number of files/folders
• Maximum number of files: 512
• Maximum number of files in a folder: 255
• Maximum depth of tree structure: 8
• Maximum number of folders: 255
(Root folder is included.)
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.
