Side-lobe reduction of a symmetric broadside array by spacing perturbation

Abstract

Side-lobe reduction of a .rynlinettic broadside array bv tuning-element spacings is presented. Through appropriate point matching and leastsquare error approximation of the radiation power distribution, Jirriher side-lobe reducrion may be achieiied without broadening the beamwidth. Three simulation results will be giL,en to show the applicability of the proposed spncing peHurbation technique in reducing side-lobe leciels. 0 1996 John Wley & Sons, Inc.

Optimal irregular microphone distributions with enhanced beamforming performance in immersive environments

“…[3][4][5] Irregular arrays have the potential to outperform regular arrays especially for immersive environments; however, the large degrees of freedom render them difficult to analyze and optimize. [3][4][5][6][7][8][9][10][11][12][13][14][15] This paper, therefore, examines the feasibility of a method to find optimal irregular geometries based on the prior knowledge of the acoustic environment for immersive microphone array optimization problems.…”

“…A linear iterative procedure based on the residuals is then used to find the optimal geometries. [6][7][8][9][10][11][12][13] Although this method can effectively sculpture the shape of gain pattern, it is limited to small perturbations to ensure prerequisite of linear approximations. Several new works 14,15 introduce numerical approaches to minimize the residues between desired gain pattern and the actual pattern, which are computed point to point based on microphone positions.…”