Analytical methods of generating multiple sound zones for open and baffled circular loudspeaker arrays | IEEE Conference Publication | IEEE Xplore

Analytical methods of generating multiple sound zones for open and baffled circular loudspeaker arrays


Abstract:

This paper proposes analytical methods for generating acoustically bright and dark zones on the horizontal plane using circular loudspeaker arrays without and with a cyli...Show More

Abstract:

This paper proposes analytical methods for generating acoustically bright and dark zones on the horizontal plane using circular loudspeaker arrays without and with a cylindrical rigid baffle. Both sound fields on the horizontal plane produced by continuous circular monopole source distributions without and with a rigid baffle are analytically calculated using 2.5D sound field representation derived from the 3D cylindrical harmonics expansion. Efficient spatial filters in the spatial Fourier series domain are analytically derived by modeling sound pressures at the control circle as a rectangular window that corresponds to bright and dark zones. The computer simulation results show that the proposed methods can generate bright and dark zones near the loudspeakers more accurately than conventional least squares and beamforming methods.
Date of Conference: 18-21 October 2015
Date Added to IEEE Xplore: 30 November 2015
ISBN Information:
Conference Location: New Paltz, NY, USA

1. Introduction

Generating acoustically bright and dark zones [1] and multiple sound zones are important and challenging acoustic communication techniques. They are useful not only for personal sound systems [2]–[8] but also for multilingual guide services and other virtual reality applications. Many methods have been proposed that control both the acoustic contrast and the energy between two spaces [1], [3] [6], [9] [14] and reproduce multiple sound fields [8], [15] [19] using multiple loudspeakers. For realizing personal audio systems and multiple sound zones, these approaches are more effective than beamforming methods [2], [20] [22], which maximize the energy to the target direction with the given input source power.

References

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