Active noise control system with horn sound feature

摘要

An active noise control system for use onboard a vehicle normally provides noise cancellation of engine sounds. The speaker of the active noise control system also emits a horn sound responsive to appropriate commands from a controller that receives a horn switch signal from a horn switch supported on a steering wheel assembly. The active noise control system controller enters a power saving mode when the vehicle ignition is turned off and the vehicle is not running. A horn switch activation during the power saving mode wakes up the controller so that the controller unmutes an amplifier and drives the speaker to emit the desired horn sound.