Alpine ICS-X7HD Owner's Manual page 57

Method for creating MP3/WMA/AAC files
Audio data is compressed using software with MP3/WMA/AAC
codecs. For details on creating MP3/WMA/AAC files, refer to the
user's manual for that software.
MP3/WMA/AAC files that are playable on this device have the
file extensions.
MP3: "mp3"
WMA: "wma" (ver. 7.x, 8.x, 9.x are 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.
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
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, 22.05 kHz, 16 kHz,
11.025 kHz, 8 kHz
Bit rates: 48 - 320 kbps
AAC
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: 16 - 320 kbps
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 (maximum 64 characters).
For non-supported characters, blank character, "No Title" is
displayed.
The number of characters may be limited, or not correctly
displayed, depending on the tag information.
Playing back MP3/WMA/AAC
MP3/WMA/AAC files are prepared, then using USB memory.
• Maximum numbers of playable files / folders
USB memory: 10,000 files/folders (including Root Folder/
®
DivX file)
• Largest playable file size: 512 MB
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 USB memory.
Corresponding File Systems
This device supports FAT 12/16/32.
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
The playback order of the folders and files is as follows. (The
following numbers may differ from actually displayed numbers.)
Root
Folder
Folder
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 (or root directory) is found at the top of the file
system. The root folder contains all folders and files. It is created
automatically for all USB memory.
MP3/WMA/AAC File
57
-EN