Alpine iLX-407 Owner's Manual page 58

What is FLAC?
FLAC (Free Lossless Audio Codec) is an audio file codec
for lossless compression, developed and offered as open
source software.
Codecs with lossy compression forms, such as MP3 and
AAC, reduce part of the data to improve compression
efficiency.
However, FLAC can reconstruct compressed data to be
an identical copy of the original data by performing
lossless compression. The compression ratio of FLAC is
about 50%.
Method for creating MP3/WMA/AAC/FLAC/WAV (USB
Flash drive) files
Audio data is compressed using software with MP3/
WMA/AAC/FLAC/WAV (USB Flash drive) codecs. For
details on creating MP3/WMA/AAC/FLAC/WAV (USB
Flash drive) files, refer to the user's manual for that
software.
MP3/WMA/AAC/FLAC/WAV (USB Flash drive) files that
are playable on this device have the file extensions.
MP3: "mp3"
WMA: "wma"
AAC: "m4a"
FLAC: "flac"/"fla"
WAV: "wav"
WMA is not supported for the following files, Windows
Media Audio Professional, Windows Media Audio 10 std
or Windows Media Audio 10 Pro Lossless.
There are many different versions of the AAC format.
Confirm that the software being used conforms to the
acceptable formats listed above. It's possible that the
format may be unplayable even though the extension is
valid.
Playback of AAC files encoded by iTunes is supported.
Supported playback sampling rates and bit rates
MP3 (USB Flash drive)
Sampling rates: 8 kHz, 11.025 kHz, 12 kHz,
16 kHz, 22.05 kHz, 24 kHz,
32 kHz, 44.1 kHz, 48 kHz
Bit rates: 8 - 320 kbps
WMA (USB Flash drive)
Sampling rates: 8 - 48 kHz
Bit rates: 8 - 384 kbps
AAC (USB Flash drive)
Sampling rates: 8 - 48 kHz
Bit rates: 8 - 384 kbps
FLAC (USB Flash drive)
Sampling rates: 8 - 48 kHz
Bit rates: 8 - 384 kbps
WAV (USB Flash drive)
Sampling rates: 8 - 48 kHz
Bit rates: 64 - 1,536 kbps
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This device may not play back correctly depending on
sampling rates.
ID3 tags/WMA tags
This device supports ID3 tag v1.0, v1.1, v2.2, v2.3, v2.4,
and WMA tag Ver.1.x. If tag data is in an MP3/WMA/AAC
file, this device can display the title (track title), artist
name, and album name ID3 tag/WMA tag data.
For non-supported characters, "?" is displayed.
The number of characters may be limited, or not
correctly displayed, depending on the tag information.
Playing back MP3/WMA/AAC/FLAC/WAV
MP3/WMA/AAC files are prepared, then written to a USB
flash drive.
• Maximum numbers of playable files/folders
USB Flash drive: 10,000 files/folders (including Root
Folder)
• Largest playable file size: 512 MB
Playback may not be performed if a USB flash drive
exceeds the limitations described above.
If a file/folder name is long, the maximum possible
number of files may decrease.
• Both Audio and Video files are counted if their formats
are playable on this unit.
Media supported
The media that this device can play back a USB flash
drive.
Corresponding File Systems
This device supports FAT 16/32.
The maximum nested folder depth is 8 (including the
root directory). File names are limited to 256 characters
(including the extension).
Valid characters for folder/file names are letters A-Z (all
caps), numbers 0-9, and '_' (underscore).
Order of files
Files are played back in the order that the writing
software writes them to the USB flash drive. Therefore,
the playback order may not be what's expected. Verity
the writing order in the software's documentation. The
playback order of the folders and files is as follows. (The
following numbers may differ from actually displayed
numbers.)