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The Effect of Scattering on Sound Field Control with a Circular Double-Layer Array of Loudspeakers

A recent study has shown that a circular double-layer array of loudspeakers makes it possible to achieve a sound field control that can generate a controlled field inside the array and reduce sound waves propagating outside the array. This is useful if it is desirable not to disturb people outside the array or to prevent the effect of reflections from the room. The study assumed free field condition, however in practice a listener will be located inside the array. The listener scatters sound waves, which propagate outward. Consequently, the scattering effect can be expected to degrade the performance of the system. This paper computationally examines the scattering effect based on the simple assumption that the listener’s head is a rigid sphere. In addition, methods to solve the problem are discussed.

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