GENERATION OF A PRIVATE SOUND ZONE BY USING ACOUSTIC DIFFERENCE CONTROL AND THE DESIGN METHOD OF THE ACOUSTIC ZONE BASED ON ARRAY BEAM PATTERN

摘要

This paper deals with the method to maximize acoustic energy difference being dependent of control effort, which is consumed to generate both the acoustically bright and quiet zone, among the selected acoustic zones. It is the acoustic difference control. Since its performance is strongly affected by designing spatial variables, the design method of the acoustic zone based on array beam pattern is also addressed. A line array simulation is performed to compare directivity of the proposed control with conventional acoustic controls. Simulation results show that directivity by the acoustic difference control is better than the others when all the control methods adopt the same design variables. It can be seen that side lobes of the reproduced pressure beam pattern is eliminated by designing different acoustic spatial variables with respect to frequencies.