About MP3 files
MP3 (MPEG 1 Audio Layer-3) is a standard
technology and format for compressing a sound
sequence. The file is compressed to about 1/10 of
its original size. Sounds outside the range of
human hearing are compressed while the sounds
we can hear are not compressed.
-
Notes on discs
You can play MP3 files recorded on CD-ROMs,
CD-Rs, and CD-RWs.
The disc must be in the ISO 9660*1 level 1 or
level 2 format, or Joliet or Romeo in the
expansion format*2.
You can use a disc recorded in Multi Session*3.
*1 ISO 9660 Format
The most common international standard for
the logical format of files and folders on a
CD-ROM.
There are several specification levels. In
Levell, file names must be in the 8.3 format
(no more than 8 characters in the name, no
more than 3 characters in the extension
".mp3") and in capital letters. Folder names
can be no longer than 8 characters. There can
be no more than 8 nested folder levels. Level
2 specifications allow file names up to 31
characters long.
Each folder can have up to 8 trees.
For Joliet or Romeo in the expansion format,
make sure of the contents of the writing
software, etc.
*2 Expansion
format
Joliet: The maximum number of characters
for album (folder) names/track (file) names
that can be displayed is 32 each.
Romeo: The maximum number of characters
for album (folder) names/track (file) names
that can be displayed is 64 each.
*3 Multi Session
This is a recording method that enables
adding of data using the Track-At-Once
method. Conventional CDs begin at a CD
control area caned the Lead-in and end at an
area called Lead-out. A Multi Session CD is a
CD having multiple sessions, with each
segment from Lead-in to Lead-out regarded
as a single session.
CD-Extra: The format which records audio
(audio CD data) as tracks on session 1, and
records data as tracks on session 2.
Mixed CD: In this format, data is recorded as
track 1, and audio (audio CD data) is recorded
as track 2.
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Notes
·
With formats other than ISO 9660 level 1 and level 2,
folder names or file names may not be displayed
correctly.
·
When naming, be sure to add the file extension
".mp3" to the file name.
·
If you put the extension
".mp3" to a file other than
MP3, the unit cannot recognize
the file properly and
will generate random noise that could damage your
speakers.
·
The foJ/owing discs take a longer time to start
playback.
- a disc recorded with complicated tree structure.
- a disc recorded
in Multi
Session.
- a disc to which data can be added.
·
If you playa high-bit rate MP3 file such as 320 kbps,
sound may be intermittent.
Cautions when playing a disc that is recorded in
Multi Session
·
When the first track of the first session is audio CD
data:
Only audio CD data of the first session is played
back.
Any data in subsequent sessions is skipped.
·
When the first track of the first session
is not audio
CD data:
-
If
an MP3 file is in the disc, only MP3 file(s) is
played back and other data is skipped.
(Audio CD
data is not recognized.)
-If no MP3 file is in the disc, "NO Music" is
displayed and nothing is played back. (Audio CD
data is not recognized.)