Fudan University professor is forced to stop artifact square dance popularity to solve noise

newspaper Cheap Marlins jerseys in Shanghai on 28 April, reporter Ping Ping reported: the controversial issue of the square dance, had around once conflicts: shots, put the Tibetan mastiff, Cheap World Series Jerseys faeces, treble cannons, has become a hot social issue. However, from the second session of China (Shanghai) will be the scene heard good news Import & Export Trading International Technology: the Fudan University scientists have successfully invented inhibition square dance "forced to stop noise artifact" -- active directional loudspeaker. Nuisance problems have been long-standing problem may be resolved.

it is reported, this invention on April 27th in Rendezvous scene appeared, immediately aroused the concern. Professor Ma Jianmin, Department of mechanics and Engineering Science, Fudan University, ordinary speaker sound is to spread from all sides, in order to realize the directional, the speaker must be very large diameter. Different from the traditional principle of speaker, active directional loudspeaker first the low frequency sound signals contained in the point to the high frequency signal is very strong, after Cheap Mariners Jerseys amplification, Cheap Rangers jerseys firing into the air, and then, the air will get high frequency signal rapid filtration, audible signal which could filter out, achieving the same directional spread like laser.

Ma Jianmin, "active directional loudspeaker to sound control in a specific region, acoustic waves in this region is very strong, and out of the region, acoustic wave can be very weak, not even. If the square dancers play music using this speaker, the nuisance 'embarrassing' can be smoothly done or easily solved." In addition to the square dance "forced Cheap kids MLB Jerseys to stop noise artifact", active directional loudspeaker can also be used in advertising, exhibition, the terminal bus station and other scenes, directional sound for specific populations.

professor Ma Jianmin said, compared with the hundreds of million of similar products, domestic "artifact" price of only several hundred to several thousand yuan, in the technical indicators, it not only better sound quality, lower energy consumption, but also is not affected by the fog, storms, dust storms and other extreme weather.

relevant personage introduces, at present domestic market has no molding products, the "God" is expected to debut at the end of this year. Optimists argue that, if a large number of listed, the square dance noise plagued people people, may have a solution satisfy both sides.