Patent ID: 8170227

Claim:
A noise control device for reducing a plurality of noises arriving at a control point by radiating a control sound to the control point, the noise control device comprising: four or more noise detectors each for detecting the plurality of noises arriving thereat, and outputting the detected noises as a noise signal; a control speaker for radiating, to the control point, the control sound based on each noise signal; and a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker, wherein the four or more noise detectors are positioned so as to form a three dimensional space, and the control point and the control speaker are positioned so as to be surrounded by the three dimensional space formed by the noise detectors.