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Evaluation of a Binaural Reproduction System Using Multiple Stereo-Dipoles

The sweet spot size of different loudspeaker configurations was investigated in a previous study carried out by the authors. Closely spaced loudspeakers showed a wider control area than the standard stereo setup. The sweet spot with respect to head rotations showed to be especially large when the loudspeakers are placed at elevated positions. In this paper we describe a system that uses the characteristics of the loudspeakers placed above the listener. The proposed system is comprised by three pairs of closely spaced loudspeakers: one pair placed in front, one placed behind and one placed above the listener. The system is based on the idea of dividing the sound reproduction into regions to reduce front-back confusions and enhance the virtual experience without the aid of a head tracker. A set of subjective experiments with the intention of evaluating and comparing the performance of the proposed system are also discussed.

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