| 摘要 |
PURPOSE: A noise reduction device is provided to efficiently reduce the noise progressed as sound-receiving point across a soundproof wall unit. CONSTITUTION: A noise reduction device comprises a soundproof wall unit(110), a support unit(120), a first fastening unit(130), a second fastening unit(140,240), a speaker fixing unit(150), and an active noise control unit(160). The support unit vertically supports the soundproof wall unit to the ground. The first fastening unit is connected to the surface facing a noise source of an upper part of the soundproof wall unit or the surface of the soundproof wall unit. The second fastening unit protrudes from the upper surface of the support unit and is separately formed from the soundproof wall unit. The speaker fixing unit is connected to the first fastening unit and the second fastening unit. The active noise control unit comprises a plurality of speaker devices connected to the speaker fixing unit.
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