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Reduction of Number of Inverse Filters for Boundary Surface Control

Boundary surface control (BoSC) is a useful method to reproduce sound ?eld physically. However, playback requires multi-channel inverse ?ltering and it is dif?cult to real-time processing with a simple computer like a laptop. Therefore, the authors proposed an “rough” reproduction system by a method for thinning out inverse ?lters of BoSC. This engineering brief report discusses which inverse ?lter should be thinned out. As a result of numerical simulation, the accuracy of the sound ?eld reproduction decreased relatively slightly when using a directional microphone array and deleting the ?lter passing through the loudspeaker far from the microphone.

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