| 摘要 |
PURPOSE: An acoustic multi-pole array and a packaging and controlling method of thereof are provided to freely change the direction of outputting sound by controlling the phase and pressure of sound source. CONSTITUTION: A first sound element(P1) is packed to have dipole sound characteristics. A second sound element(P2) is packed to have monopolar sound characteristics. The first and second elements are comprised of a voice coil speaker, a piezoelectric speaker, and an ultrasonic wave transducer. The first and second sound element are arranged in parallel with each other to form an acoustic multi-pole array(300a). |
