Toyota Avalon Service & Repair Manual: System Description

SYSTEM DESCRIPTION

ACTIVE NOISE CONTROL SYSTEM

(a) The active noise control system is a system that detects muffled engine sounds produced in sync that fluctuates according to the engine speed, by using the active noise control microphone and outputs anti-phase control sound through the audio speakers to reduce muffled engine sounds.

The active noise control system includes the following functions.

Function Name

Function Description

Operation Conditions

ANC (Active Noise Control) Function

Function that reduces noise by using anti-phase and vibration control sound to interfere with muffled sounds

Engine running, engine speed 1000 rpm or higher

ESE (Engine Sound Enhancement) Function

Function that produces realistic engine sounds by adding frequency component sound according to driving conditions such as vehicle speed and accelerator pedal depression

Engine running, vehicle speed exceeding 0 km/h (0 mph)

    Problem Symptoms Table

    System Diagram

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