Cd/Mp3/Wma/Aac Operations - Clarion DUZ388RMP Mode D'emploi

DUZ388RMP_EN.book Page 21 Monday, November 26, 2007 9:56 AM

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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