We aim to develop a noise source localization apparatus to detect the noisy vehicle from road traffic noise. This apparatus is consisted of microphone array, camera and processing computer. The microphone array is set upside of running vehicles. Now various types of vehicle pass-by noise exist in traffic flow. Therefore traffic noise is broadband acoustic noise. Hence, wide frequency range is required for source localization method. Though, present methods can't cover such a wide frequency range by itself When we try to locate traffic noise source by present method, it is required too big microphone array to install on the street. This paper proposes a technique that is a hybrid of the beamforming method and the sound intensity method. In order to study the effectiveness of this technique, we performed a test using actual vehicles driven on the test grounds.
