An intuitive approach for feedback active noise controller design

A simple and effective approach for designing feedback controllers is proposed based on analyzing the waterbed effect of the feedback active noise control system. By flattening the noise amplification due to the waterbed effect in the whole disturbance amplification frequency band intuitively, the designed feedback controller can suppress the disturbance amplification to almost the minimum value for the given disturbance attenuation and ensure good stability of the system. Being compared with the existing approaches, the main advantage of the proposed approach is its simplicity for implementation, which avoids complicated weight function selections and the numerical optimizations of the existing approaches. Detailed design procedures and implementation of the digital controller are illustrated, simulation and experiment results are provided to show the effectiveness of the proposed approach.