Clarion DUZ386MP Owner's Manual download pdf (Page 17)

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17 DUZ386MP

CD/MP3/WMA/AAC Operations

MP3/WMA/AAC

What is MP3?

MP3 is an audio compression method and

classified into audio layer 3 of MPEG standards.

This audio compression method has penetrated

into PC users and become a standard format.

This MP3 features the original audio data

compression to about 10 percent of its initial

size with a high sound quality. This means that

about 10 music CDs can be recorded on a CD-R

disc or CD-RW disc to allow a long listening time

without having to change CDs.

What is WMA?

WMA is the abbreviation of Windows Media

Audio, an audio file format developed by

Microsoft Corporation.

Notes:

• If you play a file with DRM (Digital Rights

Management) for WMA remaining ON, no audio

is output (The WMA indicator blinks).

• Windows Media™, and the Windows® logo are

trademarks, or registered trademarks of

Microsoft Corporation in the United States and/or

other countries.

● To disable DRM (Digital Rights

Management)

1. When using Windows Media Player 9/10/11,

click on TOOL ➜ OPTIONS ➜ MUSIC

RECORD tab, then under Recording

settings, unclick the Check box for RECORD

PROTECTED MUSIC. Then, reconstruct

files.

Personally constructed WMA files are used

at your own responsibility.

What is AAC?

• AAC is an acronym for “Advanced Audio

Coding” and refers to the audio compression

method used with video compression

standards MPEG-2 and MPEG-4.

• AAC files composed with the following

conditions can be played:

- AAC files encoded with iTunes.

- iTunes Ver. 7.0 or earlier.

- File extension “.m4a” (“.M4A”)

• Tracks purchased at an iTunes Music store,

and copyright-protected files cannot be

played.

• When playing AAC files that include image

data, additional time may be required before

playback begins.

• Files may not play properly, depending on the

iTunes version under which an AAC file is

encoded.

Precautions when creating MP3/

WMA/AAC file

● Usable sampling rates and bit rates

1. MP3: Sampling rate 8 kHz-48 kHz,

Bit rate 8 kbps-320 kbps / VBR

2. WMA: Bit rate 8 kbps-320 kbps

3. AAC: Sampling rate 8 kHz-48 kHz,

Bit rate 8 kbps-320 kbps / VBR

● File extensions

1. Always add a file extension “.MP3”, “.WMA”

or “.M4A” to MP3, WMA or AAC file by using

single byte letters. If you add a file extension

other than specified or forget to add the file

extension, the file cannot be played.

2. Files without MP3/WMA/AAC data will not

play. The files will be played soundlessly if

you attempt to play files without MP3/WMA/

AAC data.

∗ When VBR files are played, the play time

display may differ the play location.

∗ When MP3/WMA/AAC files are played, a little

no sound part is caused between tunes.

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