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In this paper, a novel method for the estimation of direction of arrival of sound sources using a linear microphone array has been presented. The proposed method is based on working of a null beamformer which separates observed mixed speech signals by forming a null in the direction of arrival of undesired sound sources. If the exact directional information is given, the null beamformer can eliminate undesired sound sources optimally which in turn means that the statistical independence of a speech signal increases after separation. Thus if the same is taken in reverse way, the optimality of some statistical measures of independence of the concerned speech signal can give information about the direction of arrival. The proposed method looks for sound sources in the acoustic field by steering spatial nulls of a null beamformer and estimating direction of arrival by measuring independence in terms of kurtosis of the separated spectral components of speech. Experimental results have been found as per theoretical ideas. It has been observed that the proposed method performs well in non-reverberated condition.
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