Alpine Marine iDA-X100M Owner's Manual page 21

Method for creating MP3/WMA/AAC files
Audio data is compressed by using MP3/WMA/AAC specified
software. For details on creating MP3/WMA/AAC files, refer to
the user's manual for that software.
MP3/WMA/AAC file extensions that can be played back on the
unit are as follows:
MP3: "mp3"
WMA: "wma" (ver. 7.1, 8, 9, 9.1, 9.2 supported)
AAC: "m4a"
WMA is not supported for the following files, Windows Media
Audio Professional, Windows Media Audio 9 Voice or Windows
Media Audio 9 Pro Lossless.
Depending on the software that is used to create AAC, the file
format may differ from the extension.
Unit playback of AAC files encoded by version 7.4 iTunes is
supported.
Supported playback sampling rates and bit rates
MP3
Sampling rates: 48 kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz,
16 kHz, 12 kHz, 11.025 kHz, 8 kHz
Bit rates: 8 - 320 kbps
WMA
Sampling rates: 48 kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz,
16 kHz
Bit rates: 16 - 320 kbps
AAC
Sampling rates: 48 kHz, 44.1 kHz
Bit rates: 16 - 576 kbps
This device may not play back correctly depending on sampling
rates.
ID3 tags/WMA tags
This device supports ID3 tag v1 and v2.2.0, v2.3.0 and WMA
tag. The following files do not support compression, coding,
grouping or non-synchronization.
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.
This device can only display single-byte alphanumeric
characters and the underscore. For non-supported characters,
"No Support" is displayed.
The tag information may not be correctly displayed, depending
on the contents.
Playing back MP3/WMA/AAC
MP3/WMA/AAC files are prepared, and then written to USB
memory. Or, synchronise an MP3/WMA file using Windows
Media Player (Ver. 10 or 11), and then forward to the Portable
audio player.
A USB memory device can hold up to 10, 000 files/1, 000 folders
(including Root Folders). Playback may not be performed if a
USB memory / Portable audio player device exceeds the
limitations described above.
Media supported
This device can play back USB memory / Portable audio player
media.
Corresponding File Systems
This device supports FAT 12/16/32.
Terminology
Bit rate
This is the "sound" compression rate specified for encoding. The
higher the bit rate, the higher the sound quality, but also the larger
the files.
Sampling rate
This value shows how many times per second the data is sampled
(recorded). For example, music CDs use a sampling rate of 44.1 kHz,
so the sound is sampled (recorded) 44,100 times per second. The
higher the sampling rate, the higher the sound quality, but also the
larger the volume of data.
Encoding
Converting music CDs, WAVE (AIFF) files, and other sound files into
the specified audio compression format.
Tag
Song information such as track titles, artist names, album names,
etc., written into MP3/WMA/AAC files.
Root folder
The root folder is found at the top of the file system. The root folder
contains all folders and files.
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