Auditory Distance Control Using a Variable-Directivity Loudspeaker

作者：Wendt Florian^*; Zotter Franz; Frank Matthias; Hoeldrich Robert

来源：Applied Sciences-Basel, 2017, 7(7): 666.

DOI：10.3390/app7070666

• icosahedral loudspeaker
• variable-directivity source
• auditory distance
• D/R ratio
• apparent source width

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.

• 出版日期2017-7