Notes on MP3/WMA/AAC
Notes on MP3/WMA/AAC
Playable Audio File
CQ-RX400U MP3/WMA/AAC
CQ-RX200U MP3/WMA
CQ-RX100U MP3/WMA
CQ-RX100L MP3/WMA
Notes for AAC playback is only for the model CQ-RX400U.
What is MP3/WMA/AAC?
MP3* (MPEG Audio Layer-3) and WMA (Windows Media
TM
Audio) are the compression formats of digital audio.
The former
is developed by MPEG (Motion Picture Experts Group), and
the latter is developed by Microsoft Corporation. Using these
compression formats, you can record the contents of about
10 music CDs on a single CD media (This fi gures refer to data
recorded on a 650 MB CD-R or CD-RW at a fi xed bit rate of
128 kbps and a sampling frequency of 44.1 kHz).
*MPEG Layer-3 audio coding technology licensed from
Fraunhofer.
AAC is an abbreviation for “Advanced Audio Coding”.
It has been defi ned as a standard for audio compression
technology using MPEG 2 and MPEG 4.
Note: MP3/WMA/AAC encoding and writing software is not
supplied with this unit.
Points to Remember When Making MP3/
WMA/AAC Files
Common
• High bit rate and high sampling frequency are recommended
for high quality sounds.
• Selecting VBR (Variable Bit Rate) is not recommended
because playing time is not displayed properly and sound
may be skipped.
• The playback sound quality differs depending on the
encoding circumstances. For details, refer to the instructions
of your own encoding software and writing software.
MP3
• It is recommended to set the bit rate to “128 kbps or more”
and “fi xed”.
WMA
• It is recommended to set the bit rate to “64 kbps or more”
and “fi xed”.
• Do not set the copy protect attribute on the WMA fi le to
enable this unit to play back.
AAC
• It is recommended to set the bit rate to “128 kbps or more”
and “fi xed”.
• The formats and extensions for AAC data vary according to
the encoder software used.
• AAC fi les which can be played on this unit have the “.m4a”
extension and were encoded with Apple iTunes
®
version 7.
• The fi le extension for fi les encoded with the iTunes Apple
Lossless Encoder is “.m4a”, but such fi les cannot be played
on this player.
• Files under copyright protection cannot be played.
Caution
Never assign the “.mp3”, “.wma” or “.m4a” fi le
name extension to a fi le that is not in the MP3/
WMA/AAC format. This may not only produce
noise from the speaker damage, but also damage
your hearing.
iTunes is a trademark of Apple Inc., registered in the U.S.
and other countries/regions.
Windows Media, and the
Windows logo are trademarks, or
registered trademarks of Microsoft
Corporation in the United States
and/or other countries/regions.
