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Appl. Sci. 2017, 7(3), 249; doi:10.3390/app7030249

A Measure Based on Beamforming Power for Evaluation of Sound Field Reproduction Performance

1
Center for Fluid Flow & Acoustics, Division of Physical Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Korea
2
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
*
Author to whom correspondence should be addressed.
Academic Editors: Woon-Seng Gan and Jung-Woo Choi
Received: 16 January 2017 / Accepted: 27 February 2017 / Published: 3 March 2017
(This article belongs to the Special Issue Spatial Audio)
View Full-Text   |   Download PDF [2426 KB, uploaded 7 March 2017]   |  

Abstract

This paper proposes a measure to evaluate sound field reproduction systems with an array of loudspeakers. The spatially-averaged squared error of the sound pressure between the desired and the reproduced field, namely the spatial error, has been widely used, which has considerable problems in two conditions. First, in non-anechoic conditions, room reflections substantially deteriorate the spatial error, although these room reflections affect human localization to a lesser degree. Second, for 2.5-dimensional reproduction of spherical waves, the spatial error increases consistently due to the difference in the amplitude decay rate, whereas the degradation of human localization performance is limited. The measure proposed in this study is based on the beamforming powers of the desired and the reproduced fields. Simulation and experimental results show that the proposed measure is less sensitive to room reflections and the amplitude decay than the spatial error, which is likely to agree better with the human perception of source localization. View Full-Text
Keywords: sound field reproduction; higher-order ambisonics (HOA); evaluation of reproduction performance; beamforming power; loudspeaker arrays sound field reproduction; higher-order ambisonics (HOA); evaluation of reproduction performance; beamforming power; loudspeaker arrays
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chang, J.-H.; Jeong, C.-H. A Measure Based on Beamforming Power for Evaluation of Sound Field Reproduction Performance. Appl. Sci. 2017, 7, 249.

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