Abstract
Active noise control systems offer a potential method of reducing the weight of passive acoustic treatments in vehicles and, therefore, increasing a its fuel efficiency. The active control of engine noise can be implemented cost-effectively by using the car audio loudspeakers as control sources and an array of low-cost microphones as error sensors. Such systems have been commercially implemented, but without also controlling road noise their subjective benefits may be limited. The active control of road noise using a feedforward control strategy has also been practically demonstrated, but these systems require a number of accelerometers to be mounted to the vehicle's structure to obtain a coherent reference signal and, therefore, lead to a significant implementation cost. This paper describes a multichannel feedback system for the active control of road noise, which uses an array of microphones and car audio loudspeakers that are common with ta feedforward engine noise control system. The design of the multichannel feedback controller is described and its performance is validated using offline simulations employing data measured in a small city car.
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