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Infiniti QX56 (Z62). Manual - part 40

AV-14

< SYSTEM DESCRIPTION >

SYSTEM

MULTI AV SYSTEM : System Description

INFOID:0000000006216216

Multi AV system means that the following systems are integrated.

COMMUNICATION SIGNAL

• AV control unit function by transmitting/receiving data one by one with each unit (slave unit) that configures

them completely as a master unit by connecting between units that configure MULTI AV system with two AV
communication lines (H, L).

• Two AV communication lines (H, L) adopt a twisted pair line that is resistant to noise.
• AV control unit is connected by CAN communication, and it receives data signal from ECM and combination

meter It computes and displays fuel economy information value with the obtained information. Transmitting/
receiving of data signal is performed by BCM. Also, it transmits the required signal of vehicle setting and
receives the response signal.

• AV control unit is connected with front display unit and serial communication, and it transmits the required

signal of display and display control and receives the response signal from front display unit.

NAVIGATION SYSTEM FUNCTION

Description

• The AV control unit controls navigation function while GPS tuner has built-in map data, GYRO (angle speed

sensor), on the HDD (Hard Disk Drive).

• The AV control unit inputs operation signal with communication signal, through display (touch panel) and

multifunction switch and steering switch.

• Guide sound is output to front speaker through BOSE amp. from AV control unit when operating navigation

system.

• A vehicle position is calculated with the GYRO (angle speed sensor), vehicle sensor, signal from GPS satel-

lite and map data stored on HDD (Hard Disk Drive), and transmits the map image signal (RGB image, RGB
area, RGB image synchronizing) to the display.

Position Detection Principle

The navigation system periodically calculates the current vehicle
position according to the following three types of signals.
• Travel distance of the vehicle as determined by the vehicle speed

sensor

• Vehicle turning angle determined by the gyroscope (angular speed

sensor)

• The travel direction of the vehicle determined by the GPS antenna

(GPS information)

The current position of the vehicle is then identified by comparing the
calculated vehicle position with map data, which is stored in the HDD
(Hard Disk Drive) (map-matching), and indicated on the screen with
a current location mark. More accurate data is used by comparing
position detection results from GPS to the map-matching.

FUNCTION NAME

Navigation system function

Audio function

DVD play function

Front auxiliary input function

USB connection function

Mobile entertainment system

Hands-free phone function

Touch panel function

Around view monitor function

Camera assistance sonar system

Vehicle information function

Auto Light adjustment system

JSNIA0177GB

SYSTEM

AV-15

< SYSTEM DESCRIPTION >

The current position is calculated by detecting the travel distance
from the previous calculation point, and its direction change.
• Travel distance

The travel distance is generated from the vehicle speed sensor
input signal. The automatic distance correction function is adopted
for preventing a miss-detection of the travel distance because of
tire wear etc.

• Travel direction

The gyroscope (angular velocity sensor) and GPS antenna (GPS
information) generate the change of the travel direction. Both have
advantages and disadvantages as per the following descriptions.

Input signals are prioritized in each situation. However, this order of priority may change in accordance with
more detailed travel conditions so that the travel direction is detected more accurately.

Map-matching

Map-matching repositions the vehicle on the road map when a new
location is judged to be more accurate. This is done by comparing
the current vehicle position (calculated by the normal position detec-
tion method) from the map data stored in the HDD (Hard Disk Drive).

There is a possibility that the vehicle position may not be corrected in the following case, and when vehicle is
driven over a certain distance or time in which GPS information is hard to receive. Correct manually the cur-
rent location mark on the screen.
• In map-matching, several alternative routes are prepared and pri-

oritized in addition to the road judged as currently driving on.
Therefore, due to errors in the distance and/or direction, an incor-
rect road may be prioritized, and the current location mark may be
repositioned to the incorrect road.
If two roads are running in parallel, they are of the same priority.
Therefore, the current location mark may appear on either of them
alternately, depending on maneuvering of the steering wheel and
configuration of the road, etc.

SEL684V

Type

Advantage

Disadvantage

Gyroscope (angular velocity
sensor)

The turning angle is precisely detected.

Errors are accumulated when driving a long dis-
tance without stopping.

GPS antenna (GPS informa-
tion)

The travel direction (North/South/East/West) is
detected.

The travel direction is not precisely detected when
driving slowly.

SEL685V

SEL686V

AV-16

< SYSTEM DESCRIPTION >

SYSTEM

• Map-matching does not function correctly when road on which the

vehicle is driving is new, etc. and not recorded in the map data.
Also, map-matching does not function correctly when road pattern
stored in the map data and the actual road pattern are different due
to repair, etc.
Therefore, the map-matching function judges other road as a cur-
rently driving road if the road is not in the map, and displays the
current location mark on it. Later, the current location mark may be
repositioned to the road if the correct road is detected.

• Effective range for comparing the vehicle position and travel direc-

tion calculated by the distance and direction with the road data is
limited. Therefore, correction by map-matching is not possible
when there is an excessive gap between current vehicle position and the position on the map.

GPS (Global Positioning System)

GPS (Global Positioning System) is developed for and is controlled
by the US Department of Defense. The system utilizes GPS satel-
lites (NAVSTAR), transmitting out radio waves while flying on an orbit
around the earth at an altitude of approximately 21,000 km (13,049
mile).
The receiver calculates the travel position in three dimensions (lati-
tude/longitude/altitude) according to the time lag of the radio waves
that four or more GPS satellites transmit (three-dimensional position-
ing). The GPS receiver calculates the travel position in two dimen-
sions (latitude/longitude) with the previous altitude data if the GPS
receiver receives only three radio waves (two-dimensional position-
ing). GPS position correction is not performed while stopping the
vehicle.

Accuracy of the GPS will deteriorate under the following conditions:
• In two-dimensional positioning, GPS accuracy will deteriorate when altitude of the vehicle position changes.
• The position of GPS satellite affects GPS detection precision. The position detection may not be precisely

performed.

• The position detection is not performed if GPS receiver does not receive radio waves from GPS satellites.

(Inside a tunnel, parking in a building, under an elevated highway etc.) GPS receiver may not receive radio
waves from GPS satellites if any object is placed on the GPS antenna.

NOTE:
• The detection result has an error of approximately 10 m (32.81 ft) even with a high-precision three dimen-

sional positioning.

• There may be cases when the accuracy is lowered and radio waves are stopped intentionally because the

GPS satellite signal is controlled by the US trace control center.

AUDIO FUNCTION

The audio system is equipped with the following functions. Each function is operated with multifunction switch,
preset switch, touch panel, steering switch or audio recognition. Operation status of audio is indicated at dis-
play.

Operating Signal

Audio system operation can be performed with multifunction switch, preset switch, steering switch, touch
panel function or voice recognition function.

JSNIA0180GB

SEL526V

FUNCTION

AM/FM radio

Satellite radio

Bluetooth

™

audio

Music Box (Hard Disk Drive)

Speed sensitive volume

Driver's Audio Stage

SYSTEM

AV-17

< SYSTEM DESCRIPTION >

• Operating signal is transmitted to AV control unit with AV communication when it is operated by multifunction

switch or preset switch. The disk ejection operating signal is performed by hardwire.

• Operating signal is transmitted to AV control unit with steering switch signal when it is operated by steering

switch.

Screen Display

Switching of display is performed with serial communication between front display unit and AV control unit.

AM/FM Radio Mode

• AM/FM radio tuner is built into AV control unit.
• AM/FM radio wave is received by radio antenna, next it is amplified by antenna amp., and finally it is input to

AV control unit.

• FM radio wave is received by FM sub antenna, and it is transmitted to the AV control unit directly.
• Audio signal is input to BOSE amp. and BOSE amp. outputs to each speaker.

Satellite Radio Mode

• Satellite radio tuner is built into AV control unit.
• Sound signal (satellite radio) is received by satellite radio antenna and transmitted to AV control unit. AV

control unit outputs sound signal to BOSE amp. The signal is also outputted from BOSE amp. to each
speaker.

CD Mode

• CD function is built into AV control unit.
• AV control unit outputs audio signal to BOSE amp., and BOSE amp. outputs to each speaker when CD is

inserted to AV control unit.

Bluetooth

™

Audio Mode

• Bluetooth

™

audio function is built into AV control unit.

• Bluetooth

™

audio can play music data in the portable audio by means of Bluetooth

™

communications

between the portable audio and the AV control unit.

• AV control unit outputs audio signal to BOSE amp., and BOSE amp. outputs to each speaker.

Music Box Mode

• Music CD data is stored on HDD that is built into AV control unit, and it can be played.
• AV control unit outputs music (sound signal) that is stored on HDD to BOSE amp., and BOSE amp. outputs

to each speaker.

Speed Sensitive Volume

• Volume level of this system gone up and down automatically in proportion to the vehicle speed.
• The control level can be selected by the customer.

Driver's Audio Stage

• Driver's Audio Stage controls the speaker's output characteristic by BOSE amp. so that the driver's seat is to

be the center of sounds.

• ON/OFF signals of Driver's Audio Stage are transmitted from AV control unit to BOSE amp. using mode

change signal.

DVD PLAY FUNCTION

• DVD is played by inserting DVD into the AV control unit.
• DVD image signals are transmitted to the front display unit, and DVD sound signals are transmitted to each

speaker via BOSE amp.

• DVD image signals and sound signals are transmitted to the headrest display unit via the video distributor.

The headrest display unit transmits the sound signals to the headphone via infrared communication.

USB CONNECTION FUNCTION

• Connecting iPod

or USB memory allows the driver to play iPod

music files or USB memory-stored music

files, video data, and image viewer data.

• Sound signals of music files stored in iPod

or USB memory are transmitted from the USB connector to the

AV control unit. The AV control unit transmits the sound signals to the BOSE amp. and video distributor.

• Sound signals transmitted from the BOSE amp. to each speaker, and sound signals transmitted from the

video distributor to headphone via headrest display unit

• Video signals and image viewer file signals are transmitted from the USB connector to the AV control unit.

The data and files are displayed on the front display unit screen.

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