226 Audio and Visual
Audio Operations
About MP3/WMA
MP3 (MPEG Audio Layer 3) is a standard format for audio compression. By
using MP3, a file can be compressed to about 1/10 of the original size.
WMA ( Windows Media Audio) is Microsoft's audio compression technology.
WMA files can be compressed to a size even smaller than MP3 files.
This unit only supports certain MP3/WMA file standards, recorded media
and formats. Take note of the following when writing MP3/WMA files onto a
disc.
■About the supported MP3 file standards
•Supported standards:
MPEG1/2/2.5 Audio Layer 3
•Supported sampling frequencies (kHz):
-MP3 (MPEG1 Audio Layer 3): 32, 44.1, 48
-MP3 (MPEG2 Audio Layer 3): 16, 22.05, 24
-MP3 (MPEG2.5 Audio Layer 3): 8, 11.025, 12
•Supported bit rates (kbps):-MP3 (MPEG1 Audio Layer 3): 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224,
256, 320
-MP3 (MPEG2/2.5 Audio Layer 3): 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128,
144, 160
* Supports VBR ( Variable Bit Rate).
* Does not support Audio Layer 1/2.
* Emphasis supports only 50/15ms.
* Does not support free format.
* Does not support DRM (Digital Rights Management).
•Supported channel modes:
Stereo, Joint Stereo, Dual channels, Monaural
■About the supported WMA file standards
•Supported standards:
WMA Ver. 7 to 9
•Supported sampling frequencies (kHz):
22.05, 24, 32, 44.1, 48
•Supported bit rates (kbps):
-WMA Ver. 7, 8: 48, 64, 80, 96, 128, 160, 192
-WMA Ver. 9: 48, 63, 64, 80, 95, 96, 127, 128, 160, 191, 192, 256, 320
* Supports 2-channel play only.
* Supports VBR ( Variable Bit Rate).
* Does not support WMA9 Professional/Lossless/Voice.
* Does not support DRM (Digital Rights Management).
•Supported channel modes:
Stereo, Monaural
■About ID3/WMA tags
In MP3/WMA files, you can enter textual attribute information known as
ID3 tags/WMA tags to save information such as track titles and artist
names.
This unit supports ID3v.1.0, 1.1, 2.2, 2.3 and 2.4 tags. This unit supports
the ISO 8859-1, 2, 5 and 7 codes only. Use only the ISO 8859-1, 2, 5 or 7
codes to record tags. If characters not included in ISO 8859-1, 2, 5 or 7
codes are recorded, they may not be readably displayed.
This unit supports the WMA tag ASF revision (v1.20.02). WMA tags using
only Unicode are supported. Always use Unicode characters to enter
the information.
* When Ver. 1.x and Ver. 2.x of the ID3 tags both exist, precedence is given to
Ver. 2.x.
Audio and Visual 227
Audio Operations
■About the supported media types
You can play MP3/WMA files recorded on a CD-ROM, CD-R or CD-RW
disc. Compared to the CD-ROM media commonly used for music discs,
CD-R and CD-RW discs are fragile in high temperature and high
humidity environments. It may not be possible to play some CD-R/
CD-RW discs. Fingerprints or scratches on a disc may prevent playback
or cause skipping during playback.
Some CD-R/CD-RW discs may deteriorate if left inside a vehicle for a
long time.
We recommend that you store UV-sensitive CD-R and CD-RW discs in
shield cases.
■About the supported disc formats
You can use media in the following formats.
•CD-ROM formats:
CD-ROM MODE 1, CD-ROM XA MODE 2 Form 1
•File formats:
ISO9660 Level 1 or Level 2
ROMEO system, JOLIET system
MP3/WMA files recorded in a format other than those described
above may result in files that cannot be played normally or file
names and folder names that do not display properly.
In addition to these standards, the following limitations apply.
•Maximum number of directory layers:
8 layers
•Supported characters for folder and file names:
A to Z, 0 to 9, and underscore (_)
•Number of files that can be stored on a single disc:
999
•Number of folders that can be stored on a single disc:
255
Audio and Visual 229
Audio Operations
Creating and Playing MP3/WMA Files
Creating MP3/WMA files by recording them from sources such as
broadcasts, records, recordings, videos and live performances without
permission from the copyright holder for uses other than personal
enjoyment is prohibited.
■Downloading from MP3/WMA music sites on the
Internet
You can find various types of MP3/WMA music distribution sites on the
Internet, including online shopping, trial listening, and free download
sites. You can download music files from these sites by following their
payment and other downloading rules.
■Converting a music CD into MP3/WMA files
Prepare a computer and a commercially available MP3/WMA encoder
(conversion) software (some can be found for free on the Internet).
Load a music CD into the computer's CD-ROM drive and compress the
music CD by following the procedure of the MP3/WMA encoder
software. MP3/WMA-format music data files are created. A 12 cm music
CD (with a maximum of 74 minutes of recording/650 MB of data) can
be compressed to 65 MB (about 1/10 of the original size).
■Writing MP3/WMA files on a CD-R/RW disc
MP3/WMA files can be recorded on a CD-R/RW disc by using a CD-R/
RW drive connected to a computer. Record by setting the recording
format of the recording software to ISO9660 level 1 or level 2 (not
including the extension format).
Select CD-ROM (mode 1) or CD-ROM XA (mode 2) as the disc format.
■Playing a CD-R/RW disc
Insert a CD-R/RW disc on which MP3/WMA files are recorded. When you
load a disc, the system automatically determines whether it is a music
CD or a CD-R/RW disc that contains MP3/WMA files, and plays it
correctly. However, note that depending on the type of disc being used,
the disc may not play. CAUTION
•To ensure stable sound quality during playback, we
recommend fixing the bit rate to 128 kbps and the sampling
frequency to 44.1 kHz.
•Note that it may not be possible to read some CD-R or
CD-RW discs, depending on their characteristics.
•There are many types of MP3/WMA encoding software
available, including commercial and freeware programs.
Depending on the encoder and the file format, the audio
quality may deteriorate, noise may be generated when
playing starts, or some recordings may not play.
•When files other than MP3/WMA files are recorded on a disc,
the system may take some time to recognize the disc and it
may not play.