compression ratio MAZDA MODEL CX-7 2012 Owners Manual (in English)

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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.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.
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Interior Comfort
Audio System
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The true surround sound effect of
Centerpoint®can be adjusted to any one
of five level between minimum and
maximum enhancement.
Indication Enhance level
Off
Minimum
Low
Medium
High
Maximum
Turn the audio control dial to select
CENTERPT MIN―MAX mode. The
selected mode will be indicated.
NOTElCenterpoint®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.
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.
Refer to Bluetooth® Audio on page 6-61.
Interior Comfort
Audio System
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Specifications
qEngine
ItemSpecification
2.3-liter engine 2.5-liter engine
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
qElectrical System
ItemClassification
2.3-liter engine 2.5-liter engine
Battery12V-48AH/5HR MF 12V-48AH/5HR MF
12V-55AH/5HR MF 12V-52AH/5HR MF
Spark-plug numberL3BD 18 110
*1LFG1 18 110*1
L3YD 18 110 L3Y2 18 110
Spark-plug gap 0.60―0.70 mm (0.024―0.027 in) 1.25―1.35 mm (0.049―0.053 in)
*1 ex factory
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.
qLubricant Quality
Lubricant Classification
Engine oil Refer to Recommended Oil on page 8-19.
Automatic transaxle
fluid5-speed
transaxleMazda Genuine ATF M-V
6-speed
transaxleMazda Genuine JWS3309
Transfer case oil API Service GL-5 (SAE 80W-90)
Rear differential oil API Service GL-5 (SAE 80W-90)
Power steering fluid Mazda Genuine ATF M-III, M-V, or equivalent (e.g. Dexron® II)
Brake fluid SAE J1703 or FMVSS116 DOT-3
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Specifications
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