Patent ID: 8378804

Claim:
An active acoustic control apparatus comprising: an alert sound signal generator configured to generate an alert sound signal representing an alert sound, which calls attention of a pedestrian; an alert sound output device configured to output the alert sound to an outside of a vehicle in accordance with the alert sound signal; a cancellation sound signal generator configured to generate a cancellation sound signal representing a cancellation sound to cancel the alert sound, which has been transferred from the outside of the vehicle to an inside of the vehicle, at a sound cancellation target position inside the vehicle; and a cancellation sound output device configured to output the cancellation sound to the sound cancellation target position in accordance with the cancellation sound signal, wherein the cancellation sound signal generator is configured to detect change of a transfer characteristic from the alert sound output device to the sound cancellation target position and to vary an output characteristic of the cancellation sound depending on the change of the transfer characteristic.