Noise reduction apparatus performing active noise control

摘要

A noise reduction apparatus for reducing noise propagated toward a space (5) on one side of a wall (4) from an external noise source on the other side of the wall (4). The noise reduction apparatus includes a control sound source (1), an error detector (2), and a control section (3). The control sound source (1) is placed on the wall (4) so as to block a noise propagation path. Also, the control sound source radiates a sound into the space (5). The error detector (2) detects the sound propagated from the noise source through the control sound source (1). The control section (3) causes the control sound source (1) to radiate a sound so as to minimize the sound to be detected by the error detector (2) based on the detection results of the error detector (2). <IMAGE>