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 Noise is the sound of the interference and affect people's normal working life, learning, and continuously improve the level of social production and people's material and cultural living standards, more and more strongly on the requirements of all aspects of control and eliminate noise, thus reducing the noise is an important topic in environmental protection and labor protection. 
 Foreign progress in noise control quickly, made a series of wonderful noise control technology, and some already implemented, the effect is very good. The experts of the United States and other countries "anti-noise technology is very innovative. U.S. Professor Higbee using this technology, has successfully handled a large diesel engine low-frequency noise and vibration. Diesel engine noise to a group of sensors will detect the signal input into the computer, and then the computer for the sound analysis and the "anti-noise signal through a set of clouds in the surface of the engine of the speaker to send out, so that the diesel engine on" silence " a. Some foreign Electric Company has also developed a special headset, this headset is a mini-pickup and an intercom. The sound into the headphones from the pickup into a small electrical box to accept the analysis, and measured the noise component type. This time will produce an "anti-noise" signal, the frequency of the signal and noise, but the acoustic phase is just the opposite. The two cancel each other out because of interference. The use of such a special headset, noise reduction to about 50 db. Headset in the United States and Europe at least six companies are in sales, has been widely used in aviation. Wisconsin, USA, manufacturers have to produce an air ducts in order to reduce the anti-noise devices for industrial blades of electric fans and heaters and air-conditioning system noise. New York's anti-noise experts recently declared that they manufacture for the automotive muffler, can inhibit the rumble of the engine does not weaken the engine performance and combustion efficiency. California research team has developed an electronic computer operating muffler, can eliminate the noise on the telephone. Japan has recently developed a set of "active noise control system is difficult to feel the sound waves of a human ear can be issued from the speakers under the car seat, the engine noise cancellation. That is, when driving the car, the engine noise with the road conditions and vehicle speed change, so this system, the computer will promptly calculate the acoustic frequency needed to eliminate the engine noise. The trains run on the tracks, the noise frequency is higher. England in order to eliminate this noise, the present study two methods: First, switch to the "safety rails", the second is the damping rail vibration. The study of "quiet tracks" and a height of only 110 mm, 50 mm lower than the average rails, and appropriate reduction in the cross-section of the rails. Tracks reduced height and reduced cross-sectional, is to reduce the radiation efficiency as a sound, which can reduce the noise to 5 decibels. The so-called damping rail vibration, elastic sandwich material is a metal base gasket rails. When the elastic material by the shear force, it will absorb energy and to absorb more than one wave number a constant proportion of sound energy. Therefore, it is a short-wave damping high frequency noise, the better. In addition, before putting the damper on the train wheel and fire wheel diameter is reduced, the resonant frequency, can reduce the noise. The Norwegian Government has recently produced a "muffler cement, noise-free roads and the construction of such cement. This noise road is a two-tier structure, the upper thin, 40 mm thick "wet pressing" construction technology shop in the thickness of about 200 mm on the bottom. Can be based on the gravel or pavement. Convex gel particles road refractive index, color, and the environment is very affordable, visual comfort, longer life than ordinary cement roads, up to 80 years; than hot-rolled asphalt pavement noise is 3-5 dB lower, and the rapid construction technology, Shop 24 hours can be used. German scientists have put forward the idea of ??the construction of road noise energy absorbing wall. In theory, this idea is feasible, using special materials on both sides of the road construction of this wall to absorb traffic noise and tried to make noise into electricity. This idea is only investment is too large, and sometimes a little difficult. This idea, once achieved, will meet the road lights, signal light electricity needs. 

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 Noise damping mats http://www.dibangeyin.com/ 
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