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5-60
Audio
MP3 audio
! What is MP3?
MP3 (the name is an abbreviation of ‘MPEG Audio
Layer 3’) is a compression format for digital audio. It
was developed by the Motion Picture Experts Group.
It permits audio data to be shrunk by a factor of about
10 with no loss of sound quality, meaning that the au-
dio on 10 conventional CDs can be fitted onto a single
CD-R or CD-RW (assuming a bit rate of 128 kbps and
a sampling frequency of 44.1 kHz).
NOTE
" MP3 encoding and writing software is not sup-
plied with the audio system.
" CD writing software is not supplied with the au-
dio system.
! Creating MP3 files
" To create a high-quality MP3 file, it is advisable to a
high bit rate (128 kbps or higher) and a high sampling
frequency.
" If a file is created with a variable bit rate (VBR), the
elapsed time during playback may not be displayed
correctly and the sound may skip.
" The sound quality during playback depends upon
the encoder and bit rate. Detailed information can be
found in the user’s manuals for encoder software and
writing software.
" A fixed bit rate of 128 kbps or higher is recommend-
ed.
! Saving MP3 files on a disc
" Do not save any non-MP3 file on a disc. Also, do not
save any unnecessary folder on a disc.
" If many folders and/or non-MP3 files are saved on a
disc, a delay will be caused before playback begins.
" If a disc contains both Compact Disc-Digital Audio
(CD-DA) files and MP3 files, the system will play only
the CD-DA files.
" Add the extension ‘.MP3’ to the name of every MP3
file. The system will not play any file that has either no
extension or an extension other than ‘.MP3’.
" Do not add the extension ‘.MP3’ to the name of any
non-MP3 file. Doing so could lead to speaker damage.
" The system supports multi-session recording, so
disc-at-once recording is recommended.
" The system does not support packet writing soft-
ware.
" The system does not have a playlist function.
" The system may not be able to display and play cer-
tain MP3 files depending on the writing software and
CD recorder.
" Recording must be performed using a file system
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