Gradient based microphone arrays, the horizontal sound field's plane wave decomposition, and the corresponding circular harmonics decomposition are reviewed. Further, a general relation between directivity patterns of the horizontal sound field gradients and the circular harmonics of any order is derived. Based on this relation, a number of example differential microphone arrays are analyzed, including arrays capable of approximating the sound pressure gradients necessary for obtaining the circular harmonics up to order three.

Authors: Kolundzija, Mihailo; Faller, Christof; Vetterli, Martin
Affiliation: Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
AES Convention: 128 (May 2010) Paper Number: 8092
Publication Date: May 1, 2010
Subject: Multichannel and Spatial Audio

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