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Main Title: Measurement-Based Modal Beamforming Using Planar Circular Microphone Arrays
Author(s): Zaunschirm, Markus
Zotter, Frank
Type: Conference Object
Is Part Of: 10.14279/depositonce-4103
Language Code: en
Abstract: This paper describes how to use a planar circular pressure-zone table-top microphone array for modal beamforming. Its goals are similar as for spherical arrays: higher-order resolution and a more-or-less steering-invariant beampattern design in the three-dimensional half space. As conventional circular arrays lack control of the beampattern in the vertical array plane, the proposed arrangement tries to fix this shortcoming to allow both horizontal and vertical control of beamforming. To provide a fully calibrated decomposition into the directional modes, the proposed beamforming approach is based on measurement data. From a MIMO (multiple-input-multiple-output) system description of the measurement data in the spherical harmonics domain, an inverse MIMO system of filters is designed for decomposing the microphone array signals into those spherical components eligible for modal beamforming. For an efficient measurement and robust set of decomposition filters, a reduced set of measurement positions and a regularisation strategy is suggested.
Issue Date: 18-Mar-2014
Date Available: 18-Mar-2014
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): ambisonics
sound field synthesis
spatial audio
Proceedings Title: Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014
Publisher: Universitätsverlag der TU Berlin
Publisher Place: Berlin
Page Start: 75
Page End: 80
ISBN: 978-3-7983-2704-7
Appears in Collections:FG Audiokommunikation » Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014

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