Abstract
Presented in this paper is a hybrid noise control scheme for one dimensional acoustic systems. By-combining fully active noise control with adaptive-passive elements to form a hybrid system, the control effort required for a given reduction in sound pressure level is reduced. The adaptive-passive element is a tunable Helmholtz resonator. While previous work has focused on tuning Helmholtz resonators subjected to pure tone disturbances, this work contains an algorithm which tunes the resonator in the presence of unmeasurable broadband disturbances. Because the disturbance is assumed unmeasureable, the active noise control scheme developed is a fixed filter feedback design (as opposed to adpative feedforward) and uses the dynamics of the acoustic system to achieve performance. Experimental verification is included.
