This paper presents a model of a system which is able to support Police investigations. The listening in system acquires audio signals from two microphones located around one meter to each other. System is designed to record suspect conversations under disadvantageous conditions like the loud music or the car machine noise. The presented method uses the differences between records obtained from two microphones. Different delays and different spectra separates the conversation signal from the background. The crosscorelation analysis and the band-pass filters were applied to realise the suggested algorithm.
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