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Plane wave actuators without an enclosure per se have a forward and backwardradiation. The backward radiation is unwanted in many applications when asingle direction radiation is desired. To avoid the disadvantages of anenclosure a system is proposed, which provides a high suppression of theunwanted backward radiation using a pair of plane wave actuators. This isachieved by adapted input signal filters. The influences of the second planewave actuator to the forward radiated signal are suppressed as well.Additionally, the system also provides for- and backward radiation ofdifferent signals with a high suppression of the radiation directionscrosstalk. The required power for the signal suppression depends on thephysical damping of the plane wave actuators and the space in between. Thefirst realized prototype is designed for flat panel dipole loudspeakers todeal with the mentioned problems in the acoustic domain. The filter designand a calibration algorithm for any given pairs of dipole loudspeaker areexplained. The good performance of the developed system is proven bymeasurement results with the prototype system

Signal processing for plane wave actuators