Active Noise Cancellation

Active Noise Cancellation functionality is controlled within the Radio.

The main components of the Active Noise Cancellation system are:

• 4 microphones in the vehicle headliner.
• A discrete engine speed (RPM) signal from the engine control module to the radio.
• Active Noise Cancellation electronics and software integrated into the radio.
• The vehicle speaker system, connected to the radio to output the desired cancellation frequencies.

The Active Noise Cancellation system is operational under the following conditions:

• The radio has passed all self diagnostic checks
• All doors are closed
• Battery voltage is between 9.5 V and 16 V
• The vehicle cabin temperature is less than 140°F (60°C)
• Engine speed is between 550 and 3000 RPM

The Active Noise Cancellation system is a method used to reduce the perception of certain undesirable sounds generated by the engine into the vehicle cabin. The systems uses microphone and engine speed signals, software integrated into the radio, and the vehicle speakers to determine and generate the correct frequencies needed to achieve the desired reduction.

Four microphones are located in the headliner to monitor noise/sounds in the vehicle cabin, and are directly connected to the radio. The radio also receives a discrete engine speed (RPM) signal from the engine control module. The radio processes these inputs to determine the frequency of the undesirable sound. The radio then calculates the appropriate cancellation frequency and outputs a cancellation signal (audio tone) to the vehicle speakers to reduce the perception of undesirable sounds by the vehicle occupants so the vehicle cabin appears quieter and without vibration.