A noise barrier using hybrid ANC system

Abstract

In this paper, in order to improve the low frequency noise insulation performance of a noise barrier, a new type of hybrid active noise control (ANC) system is proposed. The proposed system is a combination of feedforward and feedback controller. The reference signal for the feedforward controller is generated in the feedback part, so the reference microphone is not necessary. The feedback controller is used for controlling the acoustic boundary to insulate the diffraction noise, and the feedforward controller is used for reducing the noise at the error microphone which is set to be near the ears of people. As a preliminary work, this paper validated the effectiveness of the proposed ANC system both by simulations and by an experiment. The result shows that the active noise insulation provided by feedback controller and the noise attenuation provided by feedforward controller accumulated in the control area, so that the proposed ANC system has better control performance than individual feedforward or feedback ANC system.