Development of a Sound Source Localization System for Road Traffic Noise Combine With Image Processing Technology

In Japan, the achievement of environmental standards for noise is evaluated by long-term average sound level. Therefore, it is quite difficult to identify the factors of exceeding the regulatory limit. This study aims to establish a system that enables to conduct a separate measurement of each noise source and an evaluation of each source. By the evaluation of contribution rate of each noise source in roadside noise, it is possible to define priorities for countermeasures to deal with. The system developed in this study is a noise source visualization system which uses microphone arrays and cameras to assess the noise levels by the location of noise source. In addition, beamforming method takes into account reflection is adopted to source localization. To calculate pathway of reflection wave, the position and size of passing-by vehicle is obtained before beamforming calculation. In this paper, image processing technique is adopted to obtain the vehicle position and size.