Description: Our current treatment methods for noise pollution, there are two: one is the change of the cement road asphalt surface of the second is near the road at a distance of residential windows installation of noise barriers on both sides. But the results are not satisfactory. The road surface changes can only be reduced by about 3 to 5 db of the friction sound of car driving. As for the installation of noise barriers. Due to the diffraction characteristics of the acoustic sound propagation across the noise barriers encountered impenetrable barrier in the intermediate frequency, high frequency sound wave propagation in the back there is a weak acoustic shadow zone. Eased so move only close to the floor tenants on higher floors, the effect is not obvious
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