| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an acoustic device capable of transmitting audible sound at an audible position even an audible position and a non-audible position are coexisting in a specified space. <P>SOLUTION: An acoustic device having a modulation means 2 and a supersonic wave speaker 1, radiates audible sound waves at an audible position A in a specified space S where an audible position A and a non-audible position X are coexisting. The supersonic wave speaker 1 includes a super sonic wave device array, a delay means 7, and an amplifier 9. The acoustic device includes a location information holding part 5 for holding an audible position A location information and a control means 4 for controlling each of the delay means and the amplifiers 9. While changing the acoustic pressure of modulated signals by controlling each of the amplifiers 9 in the specified space S, the control means 4 deviates the radiation direction of interference modulated signals in a prescribed time interval by controlling each of the delay means 7, thus, shifting the audible sound wave radiation area W to the audible position A in a prescribed time interval. <P>COPYRIGHT: (C)2012,JPO&INPIT |
