AUDIO AMPLIFIER [(TYPE-B)]

id1600000010a5


Purpose

•  The audio signal (analog voltage waveform) output from the unit equipped on the vehicle is converted into a digital pulse. The converted digital pulse signal is amplified, converted to an analog signal again, and sent to the speakers.

Function


Road noise correction system (AudioPilot®)

•  The volume of the music constituent obscured by noise is corrected by the audio amplifier based on the cabin noise measured by the AudioPilot® microphone and the vehicle speed signal sent from the CMU.


Active engine sound function

•  The active engine sound function supplements the engine sound. A sound for supplementing the engine sound is output from the speakers equipped on the vehicle providing the driver an acceleration feel and a sense of speed.


On-board diagnostic function

•  The audio amplifier has an on-board diagnostic function to facilitate system diagnosis. DTCs are stored in the event of a malfunction occurring. For details, refer to the [DTC TABLE].(See DTC TABLE [CONNECTIVITY MASTER UNIT (TYPE-B) (E)].)


Operation


Audio amplifier operation

1.  The audio amplifier amplifies the audio signal sent (1) from the remote tuner (RT) and sends (2) it to the speakers.
2.  The speakers produce (3) audio based on the audio signal sent from the remote tuner (RT).
bmcozp00000755


Active engine sound operation

Note
•  When all of the following conditions are met, the active engine sound function operates.
―  CAN information can be received normally
―  Audio amplifier receives all door latch switch off signals (doors closed) via CAN communication
1.  The body control module (BCM) sends (1) the vehicle specification information to the connectivity master unit (CMU) via CAN communication.
2.  The connectivity master unit (CMU) sends (2) the received vehicle specification information to the audio amplifier via MOST communication.
3.  When the audio amplifier receives the vehicle specification information, it selects (3) the audio source used for supplementing the engine sound.
4.  When the audio amplifier receives (4) the following signals via CAN communication from the PCM, DSC HU/CM, and the TCM with the ignition switched ON (engine on), it analyzes the engine load conditions, calculates the range of insufficient engine sound, and produces (5) an engine sound supplemental signal.
PCM
―  Engine status signal
DSC HU/CM
―  Vehicle speed signal
TCM
―  Gear position signal
5.  The audio amplifier sends (6) the produced engine sound supplemental signal to the speaker.
6.  The speaker outputs (7) sound for supplementing the engine sound based on the engine sound supplemental signal received from the audio amplifier.
bmcozp00001204