compression ratio MAZDA MODEL CX-9 2012 Navigation Manual (in English)

78
Before
UseGetting
started
RoutingAddress
Book
Vo i c e Recognition
Navigation
Set Up
RDM-TMC
Audio Operation
Navigation
Set Up
■Operating tips for MP3
●
This audio system handles MP3 files that
have been recorded on CD-R/CD-RW/CD-
ROMs. Discs that have been recorded
using the following formats can be played:
• ISO 9660 level 1
• ISO 9660 level 2
• Joliet extended format
• Romeo extended format
● This unit handles MP3 files conforming to
the MP3 format containing both header
frames and data frames.
● If a disc has both music data (CD-DA) and
MP3 files, playback of the two file types
differs depending on how the disc was
recorded.
● Packet written discs cannot be played on
this unit.
● This unit does not play CDs recorded
using MP3i (MP3 interactive), MP3 PRO
and RIFF MP3 formats. Specialized glossary
MP3
Abbreviation for “MPEG Audio Layer 3”.
A technical standard for audio compression
as decided by an ISO (International
Organization for Standardization) MPEG
working group.
Use of MP3 allows for audio data to be
compressed to approximately a tenth of the
source data size.
ISO 9660
An international standard for logical
formatting of CD-ROM files and folders.
It is divided into three separate levels based
on differences in file naming procedures,
data configuration and other characteristics.
Bit rate
Refers to the volume of data per second,
expressed in bps (bits per second).
Generally, the larger the number of the
transfer bit rate when compressing an MP3
file, the more information regarding musical
reproduction it carries, and therefore the
better the sound quality.
Packet writing
A general term for the method, similar to that
used for floppy discs or hard drives, of
recording the required file in a single
increment on a CD-R and similar.
NOTE
Supply of this product only conveys a
license for private, non-commercial use
and does not convey a license nor imply
any right to use this product in any
commercial (i.e. revenue-generating) real
time broadcasting (terrestrial, satellite,
cable and/or any other media),
broadcasting/streaming via the Internet,
intranets and/or other networks or in other
electronic content distribution systems,
such as pay-audio or audio-ondemand
applications. An independent license for
such use is required. For details, please
visit http://www.mp3licensing.com.
CAUTION
This unit can only play MP3 files that have
an MP3 file extension (.mp3) attached.
Do not attach an MP3 file extension to
any other type file as it could cause noise
to be emitted or a malfunction in the unit.
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79
Audio Operation
■Operating Tips for WMA
WMA is short for Windows Media Audio and
is the audio compression format used by
Microsoft.
Audio data can be created and stored at a
higher compression ratio than MP3.
*Microsoft and Windows Media are
registered trademarks of Microsoft
Corporation U.S. in the United States and
other countries.
Playable WMA file specification
CD-R and CD-RW including WMA files can
be played with this unit. Discs which conform
to the following formats can be played.
Playable WMA files are as follows: ●
In a WMA file, the track name, artist name
and album name are recorded with data
called “WMA-Tag”, and the information can
be displayed.
● WMA files which do not comply with the
specific standard may not be played
correctly or its file and folder name may not
be displayed correctly.
● The file extension may not be provided
depending on the computer operating
system, version, software, or settings. In
this case, add the file extension “.wma” to
the end of the file name, and then write the
disc.
Item Content
Specification Windows Media
Audio Version
7.0, 8.0, 9.0
Sampling
frequency Bit rate 32kHz. . . . . . .
32, 40, 48 kbps
44.1kHz . . . . .
32, 48, 64, 80,
96, 128, 160,
192, 256, 320
kbps
48kHz. . . . . . .
64, 96, 128, 160,
192 kbps
VBR (Variable Bit
Rate) Supported
Channel mode Stereo/Monaural
WMA tag Title, artist name,
album name
CAUTION
This unit plays files with the (.wma) file
extension as a WMA file. Do not use the
WMA file extension for files other than
WMA files. It may cause noise or a
malfunction.
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