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Local Sound Field Synthesis by Virtual Acoustic Scattering and Time-Reversal

Sound field synthesis techniques, like Wave Field Synthesis and near-field compensated higher order Ambisonics, aim at synthesizing a desired sound field within an extended area using an ensemble of individually driven loudspeakers. Local sound field synthesis techniques achieve an increased accuracy within a restricted local listening area at the cost of stronger artifacts outside. This paper proposes a novel approach to local sound field synthesis that is based upon the scattering from a virtual object bounding the local listening area and the time-reversal principle of acoustics. The physical foundations of the approach are introduced and discussed. Numerical simulations of synthesized sound fields are presented, as well as a comparison to other published methods.

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