Alpine iLX-407 Owners Manual English - 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 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.) 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 58-EN