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

 

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

Bit rates:

32 - 192 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. 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.

Root folder

 

 

*

Folder

MP3/WMA/AAC File

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

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Alpine CDE-HD149BT owner manual About MP3/WMA/AAC, 15-EN

CDE-HD149BT specifications

The Alpine CDE-HD149BT is an advanced car stereo receiver that seamlessly integrates modern technology with superior audio quality, designed for music enthusiasts who demand both functionality and aesthetics. With its sleek design and user-friendly interface, this model is a great addition to any vehicle.

One of the standout features of the CDE-HD149BT is its extensive compatibility with various media formats. It supports CDs, DVDs, USB drives, and even Bluetooth connectivity, allowing users to enjoy their favorite tracks from different sources. Its built-in Bluetooth allows for hands-free calling and audio streaming, ensuring that drivers can stay connected while keeping their focus on the road.

The receiver also includes a built-in HD Radio tuner, which provides improved sound quality and access to hundreds of additional radio stations. This feature allows users to experience crystal-clear audio without the interference typically associated with traditional AM/FM broadcasts. For those who crave custom sound settings, the CDE-HD149BT offers a 9-band graphic equalizer, allowing users to adjust frequencies to their liking for a personalized listening experience.

Another notable technology in the CDE-HD149BT is its compatibility with Alpine's "iPersonalize" portal, enabling users to tailor their sound system's performance according to their vehicle's acoustics. This feature is particularly useful for audiophiles looking to optimize their sound environment.

The CDE-HD149BT features a vibrant display that presents information clearly, making it easy to navigate through playlists, incoming calls, and settings. The unit's intuitive controls, including a responsive rotary dial, enhance the overall user experience, making it simple to adjust volume or switch tracks without distraction.

Moreover, the CDE-HD149BT comes equipped with multiple preamp outputs, allowing for easy connectivity to external amplifiers and subwoofers. This ensures that users can expand their audio system to achieve deeper bass and richer sound quality.

In conclusion, the Alpine CDE-HD149BT is a versatile car stereo that combines high-fidelity audio performance with modern connectivity options. With its user-friendly features, intelligent design, and a range of customization options, it's an ideal choice for those seeking a premium in-car audio experience. Whether commuting or embarking on a road trip, this receiver offers the tools you need to enjoy your music to the fullest.