The Study on Noise Eliminating System by Adaptive Inverse Control Based on X-Filtering and DCT/LMS Algorithm

A method is provided to eliminate the noise around driver's ears from heavy construction machinery such as grab and loading machinery caused by their powerful engine and hydraulic pump based on adaptive inverse control. A controller is constructed founded on X-filtering employing DCT/LMS algorithm to drive the loudhailer installed near the driving seat, whose output waves of the same frequency and magnitude with noise transmitted to the cab will counteract each other, due to so called destructive disturbing effect, by which reducing the noise partly around the motorman's ears.