Applying the Filtered Back-Projection Method to Extract Signal at Specific Position

Abstract

In this paper, a back-projection method of extracting sound signal from multiple sources using microphone array is proposed. It is assumed that the signals received by microphone may be treated as a kind of non-straight projection. Therefore, the filtered back-projection method could be used to reconstruct the sound signal. The typical method used to enhance signal come from the focus location in multi-sources environment is the delay-and-sum method, whhich is based on the delay and shift operations. The filtered back-projection method usually is used to reconstruct the profile in the Computerized Tomography (CT). The algorithm to apply filtered back-projection method to extract the signal located at specific position is dressed in the paper. Experiments are also presented to prove the fact that filtered back-projection method could be used to extract the location-specified signal from the multi-source environment.