Acoustic Display Using High Speed 1-bit Signal Processing for Boundary Surface

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In this report, we present the recording and reproduction method of sound field by controlling a large quantity of points. Specifically, directionally controllable parametric array speaker system consisting of 576 ultrasonic transducers controlled individually, recording of sound field by using 1024ch MEMS- microphone array, and measurement of particle velocity distribution by PIV method with high speed camera are described. As a result, we have realized sound recording and reproduction systems that satisfy the spatial aliasing. And the possibilities of various applied technologies of this method are suggested.