Approaching vehicle detection using linear microphone array

Due to recent trends in society, enhanced car safety is strongly required. To prevent traffic accidents, it is necessary to detect the direction of approaching vehicles in T-intersection accurately and rapidly. This paper describes a scheme that uses a linear microphone array with four microphones to estimate the approaching vehicles. We employ a cross-correlation method to realize sound source localization and propose a direction estimation scheme based on the weighted sum of interpolated cross-correlation. Trials show that the proposed scheme offers good performance.