ACTIVE SILENCER AND ACTIVE SILENCING METHOD

To provide an active silencer and an active silencing method which can suppress interference between control sounds from each loudspeaker, and can secure silence effect for a spatially wide region, by the plurality of loudspeakers.SOLUTION: An active silencer comprises: a plurality of control microphones which observe control target sounds generated from a noise source; a plurality of control loudspeakers which emit control sounds for reducing the control target sounds; a controller 2 in which a sound signal of the control target sounds is inputted from the control microphone, and the sound signal of the control sound is outputted to the control loudspeaker; a control sound signal creation unit 7 which is prepared in the controller, in which the sound signal of the control target sounds is inputted, and which creates and outputs the sound signal of the control sounds reducing the control target sounds by feed-forward control; a monitor microphone which observes overlapped sounds in which the control target sounds and the control sounds are overlapped to output the overlapped sounds to the controller; and an amplitude adjustment unit 9 which is prepared in the controller, and adjusts the amplitude of the sound signal of the control sounds, by feedback control, depending on the overlapped sounds.SELECTED DRAWING: Figure 3 【課題】各スピーカからの制御音同士の干渉を抑制することが可能で、複数台のスピーカにより、空間的に広がりのある領域を対象として消音効果を確保することが可能なアクティブ消音装置及びアクティブ消音方法【解決手段】騒音源から発せられる制御対象音を観測する複数の制御用マイクと、制御対象音を低減する制御音を放出する複数の制御用スピーカと、制御用マイクから制御対象音の音信号が入力され、制御用スピーカへ制御音の音信号を出力するコントローラ２と、コントローラに設けられ、制御対象音の音信号が入力され、制御対象音を低減する制御音の音信号をフィードフォワード制御によって作成し出力する制御音信号作成部７と、制御対象音と制御音が重なり合った重合音を観測してコントローラへ出力するモニタ用マイクと、コントローラに設けられ、重合音に応じて、フィードバック制御により、制御音の音信号の振幅を調整する振幅調整部９とを備えた。【選択図】図３