The system includes 24 small speakers, fixed to a window grille and placed outside it a microphone. When the microphone detects sounds, the speakers emit noise-cancelling waves, reducing the power of the noise coming from outside even when the window is open.
In tests, the system has reduced the sound of typical urban traffic by up to 10 decibels, notes Ban Lam, the head of the research team from Nanyang University of Technology.
City officials often ignore the problem of noise pollution, which the World Health Organization (WHO) says can seriously harm health and is associated with hearing loss, cardiovascular disease and sleep disturbances. Some experts compare noise pollution with passive smoking.
According to Lam, a 10-decibels drop in noise exposure levels could reduce noise pollution related health risks such as hypertension and heart disease by between seven and 17 percent.
Singaporean scientists test soundproofing open windows
Residents of busy Southeast Asian cities, who face the dilemma of leaving windows open for fresh air to enter but at the same time have to endure traffic noise, can find peace of mind thanks to a new noise-suppressing technology developed by researchers in Singapore, Reuters reported, citing a publication in Syantificic Rivers, BTA reported.