MULTI AV SYSTEM : System Description

Multi AV system means that the following systems are integrated.

FUNCTION NAME
Audio function
Hands-free phone function
Rear view monitor function
Vehicle information function

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.
• The 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.
• The AV control unit is connected with display unit and serial communication, and it transmits the required signal of display and display control and receives the response signal from display unit.
• The AV control unit is receives a steering angle signal from the steering angle sensor via CAN communication and controls an expected course line during rear view monitor operation.

AUDIO FUNCTION

The audio system is equipped with the following functions. Each function is operated with multifunction switch, preset switch or steering switch. Operation status of audio is indicated at display unit.

FUNCTION
AM/FM radio
Satellite radio
CD
USB connection function
Active noise control system

Operating Signal

Audio system operation can be performed with multifunction switch, preset switch or steering switch.

• 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 display unit and AV control unit.
• The image signal to display operating condition is performed with RGB image signal, RGB area signal and RGB image synchronizing signal.

AM/FM Radio Mode

• AM/FM radio tuner is built into AV control unit.
• Sound signals (AM/FM radio) are received via window antenna.
• AM/FM main antenna signal is amplified via antenna amp. and FM sub antenna signal is transmitted to AV control unit.
• AV control unit outputs sound signal is input to active noise control unit, and active noise control unit outputs to each speaker.

Satellite Radio Mode

• Satellite radio tuner is controlled by communication signal and request signal with AV control unit.
• Sound signal (satellite radio) is received by satellite radio antenna and transmitted to AV control unit via satellite radio tuner. AV control unit is output the sound signal (satellite radio) to active noise control unit.

CD Mode

• CD function is built into AV control unit.
• AV control unit outputs the sound signal to active noise control unit, and active noise control unit output the signal to each speaker during playback.

USB Connection Function

• Connecting iPod® or USB memory allows the driver to play iPod® music files or USB memory-stored music files.
• Sound signals of music files stored in iPod® or USB memory is transmitted from the USB connector to the AV control unit. The AV control unit transmits the sound signals to the each speaker via active noise control unit.
• iPod® is recharged when connected to USB connector.
• Only files that meet the following conditions will be played.
  FILE FORMATS
  
  

  	Music file
  File format	"MP3", "WMA"
  File extension	".mp3", ".wma"
  Maximum file size	2 GB

  NOTE:

  • iPod® is a trademark of Apple inc., registered in the U.S. and other countries.
  • Image signals cannot be received from iPod® or USB memory.
  • Use the enclosed USB harness when connecting iPod® to USB connector.

Active Noise Control System

• The active noise control system outputs an anti-phase sound from the speakers (front door speaker and rear door speaker) against unpleasant engine booming noise (2nd and/or 3rd engine rev at 700 - 5000 RPM) and reduce sound pressure level by the interference with engine booming noise.
• The active noise control unit receives an engine speed signal from ECM and receives microphone signals from the front and rear microphone.
• The active noise control unit receives a door state signal. The active noise control system does not operate with any door open.
• Based on signals detected by the front and rear microphones, the active noise control unit generates an anti-phase sound (microphone signal) weakening interior engine booming noise in real time according to a unique algorithm*1 by a micro computer built in the active noise control unit. Then, the active noise control unit mixes the anti-phase sound with a sound signal received from the AV control unit to transmit the mixed sound signal to each speaker.
  NOTE: *1: Algorithm means a fixed procedure to solve a question.
  Fig 1: Active Noise Control System Output

  Courtesy of NISSAN MOTOR CO., U.S.A.

HANDS-FREE PHONE SYSTEM

• TEL adapter unit is controlled with AV communication from AV control unit.
• The connection between cellular phone and TEL adapter unit is performed with Bluetooth™ communication.
• The voice guidance signal is input from the TEL adapter unit to the AV control unit and output to the front speaker when operating the cellular phone.
• TEL adapter unit has the on board self-diagnosis function. Refer to "ON BOARD DIAGNOSIS FUNCTION ".

When A Call Is Originated

• Spoken voice sound output from the microphone (microphone signal) is input to TEL adapter unit.
• TEL adapter unit outputs to cellular phone with Bluetooth™ communication as a TEL voice signal.
• Voice sound is then heard at the other party.

When Receiving A Call

• Voice sound is input to own cellular phone from the other party.
• TEL voice signal is input to TEL adapter unit by establishing Bluetooth™ communication from cellular phone, and the signal is output to front speaker.

REAR VIEW MONITOR FUNCTION

• The AV control unit supplies power to the rear view camera when receiving a reverse signal.
• The rear view camera transmits camera images to the AV control unit when power is supplied from the AV control unit.
• The AV control unit transmits a warning message, fixed guide lines, and predictive course lines to the display unit by RGB image signal. Rear view monitor images are displayed by combining the RGB image signal and the camera image signals from the rear view camera.
• Predictive course lines are controlled by a steering angle sensor signal received the AV control unit via CAN communication.

VEHICLE INFORMATION FUNCTION

Status of audio, climate control system, fuel economy and maintenance etc. are displayed.