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Correction published on 15 November 2017, see Appl. Sci. 2017, 7(11), 1174.

Open AccessFeature PaperArticle
Appl. Sci. 2017, 7(7), 666; doi:10.3390/app7070666

Auditory Distance Control Using a Variable-Directivity Loudspeaker

Institute of Electronic Music and Acoustics, University of Music and Performing Arts Graz, Inffeldgasse 10/III, 8010 Graz, Austria
This paper is an extended version of the paper published at the International Conference on Digital Audio Effects (DAFx-16), Brno, Czech Republic, 5–9 September 2016; pp. 295–300.
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Author to whom correspondence should be addressed.
Academic Editors: Woon-Seng Gan and Jung-Woo Choi
Received: 19 April 2017 / Revised: 14 June 2017 / Accepted: 22 June 2017 / Published: 29 June 2017
(This article belongs to the Special Issue Spatial Audio)
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Abstract

The directivity of a sound source in a room influences the D/R ratio and thus the auditory distance. This study proposes various third-order beampattern pattern designs for a precise control of the D/R ratio. A comprehensive experimental study is conducted to investigate the hereby achieved effect on the auditory distance. Our first experiment auralizes the directivity variations using a virtual directional sound source in a virtual room using playback by a 24-channel loudspeaker ring. The experiment moreover shows the influence of room, source-listener distance, signal, and additional single-channel reverberation on the auditory distance. We verify the practical applicability of all the proposed beampattern pattern designs in a second experiment using a variable-directivity sound source in a real room. Predictions of experimental results are made with high accuracy, using room acoustical measures that typically predict the apparent source width. View Full-Text
Keywords: icosahedral loudspeaker; variable-directivity source; auditory distance; D/R ratio; apparent source width icosahedral loudspeaker; variable-directivity source; auditory distance; D/R ratio; apparent source width
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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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Wendt, F.; Zotter, F.; Frank, M.; Höldrich, R. Auditory Distance Control Using a Variable-Directivity Loudspeaker. Appl. Sci. 2017, 7, 666.

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