Active Noise Cancellation

Active Noise Cancellation Description and Operation

The entertainment system on this vehicle may have several different configurations. To determine the specific configuration of the vehicle, please see the Service Parts ID Label, and refer to RPO Code List (RPO Code List).

The Active Noise Cancellation system is a method used to reduce the perception of certain undesirable sounds generated by the engine. The active noise cancellation module analyzes the noise signal and outputs a cancellation signal audio tone to moderate the engine noise and make the vehicle cabin seem quieter and without vibration

Active Noise Cancellation Operation

The Active Noise Cancellation system has four main components: the active noise cancellation module, two microphones, the audio audio amplifier, and the vehicle speakers.

The two microphones are located in the headliner to monitor noise/sounds in the vehicle cabin, and are directly connected to the active noise cancellation module. The active noise cancellation module also receives a discrete engine speed (RPM) signal from the engine control module. The active noise cancellation module processes these two inputs to determine the frequency of the undesirable sound. The active noise cancellation module then calculates the appropriate cancellation frequency and outputs a cancellation signal (audio tone) to the audio amplifier which in turn sends the signal to be output by the vehicle speakers.

The active noise cancellation system is designed to moderate particular frequencies of engine noise, not to create a noise-free vehicle cabin. The system is not designed to cancel any wind or road noise, or any engine noise above 2000 RPM.