2012 MAZDA MODEL 3 HATCHBACK compression ratio

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lThe maximum number of characters
that can be used for file names is as
follows. However, this unit will only
display up to 32 characters, including
the file extension (.mp3).
Maximum number of
characters in a file name
(including a separator “.”
and the three letters of the file extension)
ISO9660 level 1 12
*
ISO9660 level 2 31*
Joliet extended
format 64
Romeo extended
format 128
* English one-byte characters (capitalized only) and underbar “_ ” are available.
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.
About ID3 Tag display
lThis unit can only display ID3 Tag
album, track and artist names that have
been input using Ver.1.0/1.1/2.2/2.3
formats. Any other data that may have
been input cannot be displayed.
lThis unit can only display English
(including numerals) one-byte
characters. Use only English (including
numerals) one-byte characters when
inputting ID3 tags. Two-byte characters
and some special symbols cannot be
displayed.
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.
Multi-session
A session is the complete amount of data
recorded from the beginning to the end of
a single period of CD-ROM, CD-R/CD-
RW data recording. Multi-session refers to
the existence of data from two or more
sessions on a single disc.
Sampling
Refers to the process of encoding analog
audio data at regular intervals and
converting it to digital data. The sampling
rate refers to the number of times a
sample is taken in one second and is
expressed in Hz units. Increasing the
sampling rate improves the sound quality
but also increases the data size.
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Interior Comfort
Audio System
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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.
ID3 Tag
ID3 tag is a method for storing
information related to the music in an
MP3 file. Information such as track, artist
and album name can be stored. This
content can be freely edited using ID3
editing function software.
VBR
Abbreviation for Variable Bit Rate. While
CBR (Constant Bit Rate) is generally
used, VBR varies the bit rate for audio
compression according to compression
conditions and this allows for
compression with preference given to
sound quality.
qOperating 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:
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.
lIn a WMA file, the track name, artist
name and album name are recorded
with data called
“WMA-Tag ”, and the
information can be displayed.
lWMA 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.
lThe 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.
Interior Comfort
Audio System
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*AudioPilot®2 (Bose®Sound System-
equipped model)
AudioPilot
®2 automatically adjusts audio
volume and sound quality in accordance
with the level of noise entering the vehicle
interior while driving. When AudioPilot
®
2 is turned on, the system automatically
calculates the conditions for optimum
hearing of sound which may be difficult
to hear depending on exterior noise.
* AudioPilot
®2 is a registered trademark
of Bose Corporation.
*Centerpoint®(Bose®Sound System-
equipped model)
Centerpoint
®offers you the experience of
5.1-channel surround sound in your
vehicle even with your conventional 2-
channel stereo CDs.
Centerpoint
®can be set on or off.
NOTE
lCenterpoint®operates optimally with a 2-
channel stereo CD. MP3 audio files can be
played, however, MP3 audio files encoded
with high compression may result in poor
sound quality.
lCenterpoint®is available for 2-channel
stereo audio except for AM radio/FM radio/
SIRIUS digital satellite radio/AUX/BT
audio.
* Centerpoint®is a registered trademark
of Bose Corporation.
BEEP setting
The beep-sound when operating the audio
system can be set on or off.
ILLM EFT setting (Action Illumination
setting during operation)
The audio system illumination during
operation can be set on or off.
Welcome mode (Welcome sound)
Sound is heard when the ignition is
switched ON.
BT SETUP modeí
Music and other audio such as voice data
recorded on portable audio devices and
mobile phones available on the market
which are equipped with the Bluetooth
transmission function can be listened to
via wireless transmission over the
vehicle's speakers. Using the BT SETUP
mode, these devices can be programmed
to the Bluetooth unit or changed. For
details, refer to Bluetooth audio (page
6-62).
Interior Comfort
Audio System
6-31íSome models.
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Specifications
qEngine
Item Specification
MZR 2.0 SKYACTIV-G 2.0
Type DOHC-16V in-line, 4-cylinder
Bore × Stroke 87.5 × 83.1 mm (3.44 × 3.27 in) 83.5 × 91.2 mm (3.29 × 3.59 in)
Displacement 1,999 ml (1,999 cc, 122.0 cu in) 1,998 ml (1,998 cc, 121.9 cu in)
Compression ratio 10.0 12.0
Item Specification
MZR 2.3 DISI Turbo MZR 2.5
Type DOHC-16V in-line, 4-cylinder
Bore × Stroke 87.5 × 94.0 mm (3.44 × 3.70 in) 89.0 × 100 mm (3.50 × 3.94 in)
Displacement 2,261 ml (2,261 cc, 138.0 cu in) 2,488 ml (2,488 cc, 151.8 cu in)
Compression ratio 9.5 9.7
q Electrical System
Item Classification
MZR 2.0 SKYACTIV-G 2.0
Battery 12V-40AH/5HR, 12V-52AH/5HR 12V-48AH/5HR, 12V-52AH/5HR
Spark-plug number NGK ILTR5A13G NGK DILKAR7F8
DENSO FC20HPR8
Spark-plug gap 1.25 ―1.35 mm (0.049 ―0.053 in) 0.75 ―0.85 mm (0.030 ―0.033 in)
Item Classification
MZR 2.3 DISI Turbo MZR 2.5
Battery 12V-48AH/5HR, 12V-52AH/5HR 12V-40AH/5HR, 12V-48AH/5HR,
12V-52AH/5HR
Spark-plug number NGK SILTR6A7G NGKILTR5A13G
Spark-plug gap 0.60―0.70 mm (0.024 ―0.027 in) 1.25 ―1.35 mm (0.049 ―0.053 in)
CAUTION
When cleaning the iridium plugs, do not use a wire brush. The fine particulate
coating on the iridium alloy and platinum tips could be damaged.
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Specifications
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