2
1
3
4
5
6
8
1
8
7
–
–
What is MP3/WMA?
MP3 (MPEG Audio Layer-3) and WMA (Windows
Media™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 CD 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).
Note:
MP3/WMA encoding and writing software is not
supplied with this unit.
Points to remember when
making MP3/WMA fi les
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 user
manual 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”.
* MPEG Layer-3 audio coding technology licensed from
Fraunhofer IIS and Thomson.
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.
Notes on MP3/ WMA
Display information
Displayed items
CD-TEXT
Disc
title
Track
title
MP3 (ID3 tag)
Album
name
Title name/artist name
MP3/WMA
Folder
name
File
name
WMA (WMA tag)
Album
name
Title name/artist name
Displayable characters
Displayable length of fi le name/folder name: within
64 characters. (Unicoded fi le and folder names
are reduced by half in the number of displayable
characters.)
Name fi les and folders in accordance with the
standard of each fi le system. Refer to the instructions
of writing software for details.
ASCII character set and special characters in each
language can be displayed.
ASCII character set
A to Z, a to z, digits 0 to 9, and the following symbols:
(space) ! ” # $ % & ’ ( ) * + , - . / : ; < = > ? @ [ \ ] ˆ_ ` { |
} ~
Note:
With some software in which MP3/WMA format fi les
have been encoded, the character information may not
be displayed properly.
Undisplayable characters and symbols will be
converted into an middle dot.
Compression formats
(
Recommendation
: “Points to remember when making MP3/WMA fi les” on the previous page)
Compression method
Bit rate
VBR
Sampling frequency
MPEG 1 audio layer 3 (MP3)
32 k – 320 kbps
Yes
32, 44.1, 48 kHz
MPEG 2 audio layer 3 (MP3)
8 k – 160 kbps
Yes
16, 22.05, 24 kHz
Windows Media Audio Ver. 7, 8, 9*
32 k – 192 kbps
Yes
32, 44.1, 48 kHz
* WMA 9 Professional/LossLess/Voice are not supported.
Folder selection order/fi le playback order
Maximum number of fi les/folders
Maximum number of fi les: 511 (fi les + folders)
Maximum number of fi les in one folder: 255
Maximum depth of trees: 8
Maximum number of folders: 192 (Root folder is
included.)
Note:
You can shorten the duration between data read and
playback by decreasing the quantity of fi les or folders,
or the depth of the hierarchy.
This unit counts the number of folders irrespective of
the presence or absence of an MP3/WMA fi le.
If the selected folder does not contain any MP3/WMA
fi les, the nearest MP3/WMA fi les in the order of
playback will be played.
Playback order may be different from other MP3/WMA
players even if the same disc is used.
“ROOT FOLDER” appears when displaying the root
folder name.
Recording MP3/WMA fi les on a CD-media
You are recommended to minimize the chances of
making a disc that contains both CD-DA fi les and
MP3/WMA fi les.
If CD-DA fi les are on the same disc as MP3 or WMA
fi les, the songs may not play in the intended order,
or some songs may not play at all.
When storing MP3 data and WMA data on the same
disc, use different folders for each data.
Do not record fi les other than MP3/WMA fi les and
unnecessary folder on a disc.
The name of an MP3/WMA fi le should be added by
rules as shown in the following descriptions and also
comply with the rules of each fi le system.
You may encounter trouble in playing MP3/WMA
fi les or displaying the information of MP3/WMA
fi les recorded with certain writing software or CD
recorders.
The fi le extension “.mp3” or “.wma” should be
assigned to each fi le depending on the fi le format.
This unit does not have a play list function.
Although Multi-session recording is supported, the
use of Disc-at-Once is recommended.
Supported fi le systems
ISO 9660 Level 1/Level 2, Apple Extension to ISO 9660,
Joliet, Romeo
Note:
Apple HFS, UDF 1.50, Mix CD and CD Extra are not
supported.
Root Folder
(Root Directory)
Folder Selection
In the order
File Selection
In the order
Tree 1
Tree 2
Tree 3
Tree 4
Tree 8
(Max.)
Caution:
Never assign the “.mp3”, or “.wma” fi le name
extension to a fi le that is not in the MP3/WMA
format. This may not only produce noise from the
speaker damage, but also damage your hearing.
Windows Media, and the Windows
logo are trademarks, or registered
trademarks of Microsoft Corporation
in the United States and/or other
countries/regions.
Copyright
It is prohibited by copyright laws to copy, distribute and
deliver copyrighted materials such as music without the
approval of copyright holder except enjoying yourself
personally.
No warranty
Above description complies with our investigations as
of February 2007. It has no warranty for reproducibility
and displayability of MP3/WMA.
English
English
108
109
109
108
Содержание CN-NVD905U - Strada - Navigation System
Страница 117: ...Memorandum 343 ...
