Clarion Automobile Accessories - Manual (Page 17)

19
M475
English
CD/MP3/WMA Operations
MP3/WMA
What is MP3?
MP3 is an audio compression method and
classified into audio layer 3 of MPEG standards.
This audio compression method has penetrated
into PC users and become a standard format.
This MP3 features the original audio data
compression to about 10 percent of its initial size
with a high sound quality. This means that about
10 music CDs can be recorded on a CD-R disc or
CD-RW disc to allow a long listening time without
having to change CDs.
What is WMA?
WMA is the abbreviation of Windows Media
Audio, an audio file format developed by
Microsoft Corporation.
Notes:
• If you play a file with DRM (Digital Rights
Management) for WMA remaining ON, no audio is
output (The WMA indicator blinks).
• Windows Media™, and the Windows ® logo are
trademarks, or registered trademarks of Microsoft
Corporation in the United States and/or other
countries.
● To disable DRM (Digital Rights
Management)
1. When using Windows Media Player 9, click on
TOOL ➜ OPTIONS ➜ MUSIC RECORD tab,
then under Recording settings, uncheck the
Check box for RECORD PROTECTED
MUSIC. Then, reconstruct files.
Personally constructed WMA files are used at
your own responsibility.
2. When using Windows Media Player 10, click
on TOOLS ➜ OPTIONS ➜ RIP MUSIC tab,
then under RIP SETTINGS, uncheck the
Check box for COPY PROTECT MUSIC.
Then, reconstruct files.
Personally constructed WMA files are used at
your own responsibility.
Precautions when creating MP3/
WMA files
● Usable sampling rates and bit rates
• MP3: Sampling rate 11.025 kHz-48 kHz,
Bit rate 8 kbps-320 kbps / VBR
• WMA: Bit rate 48 kbps-192 kbps
● File extensions
• Always add a file extension “.MP3” or “.WMA”
to MP3 or WMA file by using single byte letters.
If you add a file extension other than specified
or forget to add the file extension, the file
cannot be played.
• Files without MP3/WMA data will not play. The
indication “--:--” appears in the play time
display if you attempt to play files without MP3/
WMA data.
● Logical format (File system)
• When writing MP3/WMA file on a CD-R disc or
CD-RW disc, please select “ISO9660 level 1, 2
or JOLIET or Romeo” as the writing software
format. Normal play may not be possible if the
disc is recorded on another format.
• The folder name and file name can be
displayed as the title during MP3/WMA play but
the title must be within 128 single byte
alphabetical letters and numerals (including an
extension).
• Do not affix a name to a file inside a folder
having the same name.
● Folder structure
• A disc with a folder having more than 8
hierarchical levels will be impossible.
● Number of files or folders
• Up to 255 files can be recognized per folder.
Up to 512 files can be played.
• Tracks are played in the order that they were
recorded onto a disc (Tracks might not always
be played in the order displayed on the PC).
• Some noise may occur depending on the type
of encoder software used while recording.
M475.book Page 19 Thursday, December 21, 2006 4:08 PM