A MODERN CONTROL APPROACH TO ACTIVE NOISE-CONTROL

Active noise control systems currently in use and/or described in the research literature are typically based on adaptive signal processing theory or, equivalently, adaptive feedforward control theory. This pap er presents a modern control approach to the problem of active noise c ancellation in a three-dimensional space. The controller is designed b ased on a direct self-tuning regulator. Two forms of adaptive control, namely, pole placement and minimum variance controls are considered a nd compared in simulation. An implementation of the adaptive minimum v ariance controller is used to successfully attenuate a harmonic distur bance in a laboratory setting.