Audio Function

Description

• The audio function is adoption of the following system, and it is equipped with the following functions.

• The adoption of the AudioPilot® 2 Noise Compensation Technology enables the correction of frequency bands which tend to be masked by driving noise.
• The BOSE Stereo Sound System features 8-channel amplifier and ten high-performance 3-way speakers integrated into the front doors. Furthermore, the 6x9 inch woofers mounted in the front doors provide deep bass sound.
• With the adoption of 14EQch digital amplifier and 16 speakers, BOSE® Studio Surround® Sound System provides smooth and natural sound over the range from bass to treble through the optimum placement of speakers for each seat and the control of amplifier.
• BOSE® Studio Surround® Sound System is adoption of BOSE® Centerpoint® 2 enables sound effects with a sense of realism even to playback sound of two-channel audio.
• The table below shows speakers mounted to each system.

Operating Signal

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

• 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.

Operation status of audio is indicated at display unit.

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 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 is 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 sound signal to BOSE amp., and BOSE amp. outputs the signal to each speaker during playback.

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 sound signal to BOSE amp., and BOSE amp. outputs to each speaker.

Music Box Mode (for Mexico)

• 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.

AudioPilot® 2 Noise Compensation Technology

• AudioPilot® 2 continuously corrects audio signals to compensate for background noise.
• AudioPilot® 2 noise compensation technology is a sound improving system that picks up by a front microphone any noises or the sound of music coming into the vehicle, and that uses the BOSE amp. to revise the frequency feature of music in real time in response to the frequency feature of the noise while driving and listening to music.
  Fig 1: Identifying Front Microphone Function Diagram (Audio Pilot® 2 Noise Compensation Technology)

  Courtesy of NISSAN NORTH AMERICA, INC.

*: DSP stands for Digital Signal Processor and enables digital processing of sound signals. DSP features precise signal processing and calculation with the digital technology on a small scale that analog methods find it difficult to process and calculate.

BOSE® Centerpoint® 2 (BOSE® Studio Surround® Sound System)

• BOSE® Centerpoint® 2 provides a surround-sound effect, based on a stereo sound source, such as CD or MP3.
• The BOSE amp. receives a BOSE® Centerpoint® 2 ON signal during a stereophonic sound playback and divides the sound among five channels to add a sense of simulated surround playback sound.

Active Noise Control System

• The active noise control system incorporates the BOSE Engine Harmonic Cancellation (EHC) technology.
• The active noise control system outputs an antiphase sound from the speakers (front door speaker, rear door speaker and rear woofer) against unpleasant engine booming noise (2nd and/or 3rd engine rev at 700 - 5000 rpm) and reduces sound pressure level by the interference with engine booming noise. (VQ37VHR models)
• The active noise control system outputs an antiphase sound from the speakers (front door speaker, rear door speaker and rear woofer) against unpleasant engine booming noise (4th engine rev at Idle speed - 2500 rpm) and reduces sound pressure level by the interference with engine booming noise. (VK56VD models)
• The BOSE amp. receives an engine speed signal from ECM and receives microphone signals from the front and rear microphone.
• The BOSE amp. 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 BOSE amp. generates an antiphase sound (microphone signal) weakening interior engine booming noise in real time according to a unique algorithm^*1 by a DSP^*2 built in the BOSE amp. Then, the BOSE amp. mixes the antiphase 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.
  *2: DSP stands for Digital Signal Processor and enables digital processing of sound signals. DSP features precise signal processing and calculation with the digital technology on a small scale that analog methods find it difficult to process and calculate.
  Fig 2: Antiphase Operating Sound Generation Signal Waveform

  Courtesy of NISSAN NORTH AMERICA, INC.