Alpine CDE-HD149BT Owner's Manual download pdf (Page 15)

15-EN

About MP3/WMA/AAC

CAUTION

Except for private use, duplicating audio data (including MP3/

WMA/AAC 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 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 is similar to MP3 audio data.

What is AAC?

AAC is the abbreviation for “Advanced Audio Coding”, and is a basic

format of audio compression used by MPEG2 or MPEG4.

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”/“wma”/“m4a”. Files with no extension cannot be

played back (WMA ver. 7 , 8 and 9 are supported). Protected files are not

supported, neither are raw AAC files (using the “.aac” extension).

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

WMA

AAC

This device may not play back correctly depending on sampling rates.

In the USB mode, the playback time may not be correctly displayed

when a VBR (Variable Bit Rate) recorded file is played back.

ID3 tags/WMA tags

This device supports ID3 tag v1 and v2, and WMA/AAC tag.

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/AAC tag data.

This device can only display single-byte alphanumeric characters (up to

32 for ID3 tags and up to 32 for WMA tags) and the underscore. For

non-supported characters, “No Support” is displayed or the character is

displayed as space.

If information contains characters other than ID3 tag information, the

audio file may not be played back.

The tag information may not be correctly displayed, depending on the

contents.

Playing back MP3/WMA/AAC

MP3/WMA/AAC files are prepared, then written to a CD-R, CD-RW using

CD-R writing software or stored to a Flash Memory. A disc can hold up

to 509 files/folders (including Root Folders), and the maximum number

of folders is 255.

Playback may not be performed if a disc exceeds the limitations

described above.

Media supported

The media that this device can play back are CD-ROMs, CD-Rs, and

CD-RWs.

This device also can play back Flash Memory media.

Corresponding File Systems

This device supports discs formatted with ISO9660 Level 1 or Level 2.

Under the ISO9660 standard, there are some restrictions to remember.

The maximum nested folder depth is 8 (including the root directory).

The number of characters for a folder/file name is limited.

Valid characters for folder/file names are letters A-Z (all caps), numbers

0-9, and ‘_’ (underscore).

This device also can play back discs in Joliet, Romeo, etc., and other

standards that conform to ISO9660. However, sometimes the file

names, folder names, etc., are not displayed correctly.

This device also supports FAT 12/16/32 for Flash Memory device.

Formats supported

This device supports CD-ROM XA, Mixed Mode CD, Enhanced CD

(CD-Extra) and Multi-Session.

This device cannot correctly play back discs recorded with Track At

Once or packet writing.

Order of files

Files are played back in the order that the writing software writes them

to the disc. Therefore, the playback order may not be what is expected.

Verify the writing order in the software’s documentation. The playback

order of the folders and files is as follows.

* The folder No./ folder Name will not be displayed if no file is contained

in the folder.

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

Sampling rates: 48 kHz, 44.1 kHz, 32 kHz

Bit rates: 32 - 192 kbps

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

Root folder

Folder

MP3/WMA/AAC File

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 56 57

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Alpine CDE-HD149BT Owner's Manual Page 15

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