| 摘要 |
PURPOSE:To provide the active sound elimination device which obtains high control efficiency and can be constituted at low cost by simplifying the system. CONSTITUTION:A mechano-electric transducer 71 is installed in a control area 5 and a detected signal is inputted as a reference and error signal xsi to a signal processing circuit 8 through an amplifier 72. The signal processing circuit 8 processes a control signal S so that the wave motion becomes minimum in the control area 5 and sends it to an electro-mechanical transducer 41 for control through an amplifier 42, thereby generating wave motion for control. An error signal and a reference signal are based upon the same signal and coherence, therefore, becomes 1, so that the control efficiency can be improved. |
