Because of the square dance nuisance problems, conflicts around the frequent. 2014 March 29, Wenzhou City Center, the new Guoguang Building Owners' Committee because of the square dance noise is unbearable, the spontaneous advance of 260,000 yuan to buy the treble artillery "fight" square noise, this matter has attracted the attention of all walks of life. New Guoguang Building **** 6 buildings, there are more than 600 permanent residents. Residents reflect the singing and square dancing "subwoofer", every day "marathon" like from 6 a.m. to 10 p.m. rounds of "bombing". After coordination, the residents will be "remote directional sound amplification system" removed.
Square dancing has risen to the height of social issues. Firing guns, Tibetan mastiffs, throwing manure, treble cannons and other measures, fierce confrontation was born above the extreme eviction events, but most of the two lose, and even illegal.
So in 2014, the second session of the Fudan University Department of Mechanics and Engineering Science Professor Ma Jianmin has successfully invented a square dance noise "stopping artifacts" - active directional speakers.