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NOISE REDUCTION DEVICE

  • US 20100014683A1
  • Filed: 07/13/2009
  • Published: 01/21/2010
  • Est. Priority Date: 07/15/2008
  • Status: Active Grant
First Claim
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1. A noise reduction device comprising:

  • a noise detection unit including a high-frequency noise detection unit and a low-frequency noise detection unit for respectively detecting a high-frequency noise and a low-frequency noise generated from a noise source;

    a noise controlling unit for generating a control sound signal for cancelling a noise detected by the noise detection unit in a control center of control space; and

    a control sound outputting unit for outputting a control sound based on the control sound signal from the noise controlling unit,wherein the high-frequency noise detection unit is disposed in a vicinity of the control center in a state in which directivity in an opposite direction with respect to the control center is added, andthe low-frequency noise detection unit is disposed in a position in which a sound emitted from the vicinity of the control center is attenuated to a predetermined level.

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