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Acoustically Hard 2D Arrays for 3D HOA

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The acquisition of higher-order ambisonic signals presents a technical challenge which has been met by several authors proposing a number of different array geometries and sensor types. The current paper presents a class of arrays whose performance has not been assessed before; arrays comprising only pressure-sensitive sensors on both sides of an acoustically hard plate. The combined acoustical and signal processing system is analyzed and numerical experiments on an optimized third order array provide a performance comparison with a more conventional hard-shell spherical microphone array. The model is verified by measurements.

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