105 Basic Study on Improvement of Active Noise Control System for Noise Barrier : Phase-2:Experiments in Anechoic Room

Several studies have been made on active noise control for noise barrier. However their systems were insufficient to attenuate the noise at a little diffraction area. In this paper, a new concept of active noise barrier was proposed, which has a lot of active cells, on the top of barrier and being controlled individually by the feed forward method. The characteristics of this system is that they have the reference microphones just in front of the speakers and the control points at a little far away from the speakers. Here, this system was theoretically proved to be effective. And, the feasibility of this system was proved by experiments in an anechoic room and BEM simulations.