Abstract
This paper aims decreasing side lobes and gets high sound pressure difference between sound spot and other points. In order to side lobes, we propse two way. One is "number of speaker interval of speaker/wavlength "enlarged. Other is speaker output control. After authores confirm effect by using each poposal technique by simulation, we measure by using 256ch plane speaker array. The measurement result showed to control the existing high pitched sound pressure areas of 70〜75dB other than the focus in a past DSBF method.
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