Alpine CDA-9851 12

12-EN

About MP3/WMA

CAUTION

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

WMA 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-1 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 allows you to create music files and store them at higher

ratios of compression than MP3 audio data (approx. half

original size). This is achieved while still maintaining CD

quality sound.

Method for creating MP3/WMA files

Audio data is compressed by using MP3/WMA specified software.

For details on creating MP3/WMA files, refer to the user's manual

for that software.

MP3/WMA files that can be played back by this device have the file

extension “mp3” / “wma”. Files with no extension cannot be played

back. (WMA ver. 7.1, 8 and 9 are 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

Variable Bit rates: 8 - 320 kbps

WMA

Sampling rates : 48 kHz, 44.1 kHz, 32 kHz

Bit rates: 48 - 192 kbps

Variable Bit rates: 48 - 320 kbps

Note that for sampling rates, this device’s frame display (Page

9) may not display correctly.

This device may not play back correctly depending on

sampling rates.

ID3 tags/WMA tags

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

If tag data is in an MP3/WMA 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 (up to 30 for ID3 tags and up to 15 for WMA tags)

and the underscore. For non-supported characters, “NO

SUPPORT” is displayed.

The tag information may not be correctly displayed,

depending on the contents.

Producing MP3/WMA discs

MP3/WMA files are prepared, then written to a CD-R or CD-

RW using CD-R writing software. A disc can hold up to 510

files/folders (including Root Folders). However, the maximum

number of folders is 255.

Media supported

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

Rs, and CD-RWs.

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 folder/file name characters 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.

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 tracks

The unit plays the files in the order that the writing software

writes them. Therefore, the playing order may not be the same

as the order you input. The playback order of the folders and

files is as follows. However, the folder and file playback order

differs from the folder no. and file no. indicated on the display.

Root folder

Folder MP3/WMA File