Implementation of the controller for a compound active noise-cancellation earmuff

A system model of a compound active noise-cancellation earmuff(CANCE)is described by means of transfer function, and the optimal order ofthe controllers is discussed. Practical circuits are given to implementboth the feedforward controller and the feedback controller. A practicalCANCE is fabricated, and the noise cancellation effect is tested, sothat the effectiveness of the inplementation method is verified.