Alpine DVI-9990, Owner'S Manual

Page: 111 / 121

103
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EN
About MP3/WMA
CAUTION
Except for private use, duplicating
audio data (including MP3/WMA data)
or distributing, transferring, or copying
it, whether for free or for a fee, without
permission of the copyright holder is
strictly prohibited by the Copyright Act
and by international treaty.
What is MP3?
MP3, whose official name is “MPEG-1
Audio Layer 3,” is a compression standard
prescribed by the ISO, the International
Standardization Organization and MPEG
which is a joint activity institution of the
IEC.
MP3 files contain compressed audio data.
MP3 encoding is capable of compressing
audio data at extremely high ratios,
reducing the size of music files to as much
as one-tenth their original size. This is
achieved while still maintaining near CD
quality. The MP3 format realizes such
high compression ratios by eliminating the
sounds that are either inaudible to the
human ear or masked by other sounds.
What is WMA?
WMA, or “Windows Media™ Audio,” is
compressed audio data.
WMA allows you to create music files and
store them at higher ratios of compression
than MP3 audio data (approx. half original
size). This is achieved while still main-
taining CD quality sound.
Method for creating MP3/WMA
files
Audio data is compressed by using MP3/
WMA specified software. For details on
creating MP3/WMA files, refer to the
user’s manual for that software.
MP3/WMA files that can be played back
by this device have the file extension
“mp3” / “wma”. Files with no extension
cannot be played back. (WMA ver. 7.1 and
8 are supported)
Supported playback sampling
rates and bit rates
MP3
Sampling rates:32 kHz, 44.1 kHz, 48 kHz
Bit rates:
32 - 320 kbps
WMA
Sampling rates:32 kHz, 44.1 kHz, 48 kHz
Bit rates:
20 - 192 kbps
Note that for sampling rates, this device’s
frame display (Page 59) may not display
correctly.
This device may not play back correctly
depending on sampling rates.
ID3 tags/WMA tags
This device supports ID3 tag v1 and
WMA tag.
If tag data is in an MP3/WMA file, this
device can display the title (track title),
artist name, and album name ID3 tag/
WMA tag data.
This device can only display single-byte
alphanumeric characters (up to 30) and the
underscore. For non-supported characters,
“NO SUPPORT” is displayed.
The tag information may not be correctly
displayed, depending on the contents.
Producing MP3/WMA discs
MP3/WMA files are prepared, then
written to a CD-R or CD-RW using CD-R
writing software. A disc can hold up to
255 files and 255 folders (including Root
Folders).
Depending on the structure of the folders
or files, it may take time to read a disc. In
this case, it is recommended to decrease
the number of folders or files.