This paper describes the application of array optimization techniques to improving the near-field response of an arbitrary microphone array. The optimization exploits the differences in wavefront curvature between near-field and far-field sound sources and is suitable for reverberation reduction in small rooms. The optimum near-field beamformer provides increased array gain over that obtained from a uniformly weighted delay-and-sum beamformer.

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Conference Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP. Part 1 (of 5)
Ryan, James G., & Goubran, R. (1997). Near-field beamforming for microphone arrays. In ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings (pp. 363–366).