Array optimization applied in the near field of a microphone array

作     者：Ryan, JG Goubran, RA 

作者机构：Natl Res Council Canada Inst Microstruct Sci Acoust & Signal Proc Grp Ottawa ON K1A 0R6 Canada 

出 版 物：《IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING》 (IEEE Trans Speech Audio Process)

年 卷 期：2000年第8卷第2期

页      面：173-176页

核心收录：

主　　题：array optimization array processing microphone array nearfield beamforming 

摘      要：This paper describes the application of array optimization techniques in the near-field of a microphone array. It is shown that the optimum weights obtained for microphone spacing equal to a half wavelength are real, aside from the propagation delay, and inversely proportional to the distance from each microphone to the focal point, When the microphone spacing is less than half wavelength, the optimum weights are super-directive requiring both an amplitude and phase adjustment in addition to delay-and-sum beamforming, In the super-directive regime, the maximum array gain increases as the distance to the focal points decreases. The technique is suitable for applications where the source of interest is located in the near-field region but interfering sources are located farther from the array.