DUCT FEED-BACK ACTIVE NOISE CONTROLLING APPARATUS amp; METHOD REINFORCED BY FEEDFORWARD CONTROLLING METHOD

摘要

The apparatus and method improves a noise control performance by using a residual noise sensing microphone when it is impossible to install a microphone sensing an original noise at a feedforward controller. The apparatus comprises 2 control means(40,41) generating control sound with a phase opposite to the noise progressing along a duct(10); 2 residual noise sensors(30,31) installed rear the control means(40,41); a feedback controller(W1) and a feedforward controller(W2) generating control outputs for the control means(40,41) by applying a least mean square method to the sensed residual noise signals(e1,e2).