\n<\/p>\n
Twenty-five homes across the island were chosen to be measured, to experience what it is like to live with road, train and air traffic. To observe road and train traffic, homes with noise sources \u2013 such as roads and MRT tracks \u2013 directly visible from the window were chosen. Distances from the source ranged from 17m to 85m (adjusted for height). To observe air traffic, homes chosen were located near airbases or airports where occupants reported significant aircraft noise. Distances from the source ranged from 1.1km to 2.3km.<\/p>\n
We recorded three to six hours of sound at each location, accumulating more than 100 hours of audio data. The sound level meter was mounted on a stand at window height, positioned approximately 10cm from an open window facing the noise source. Occupants were advised to vacate the recording room or remain silent with the doors closed for the duration of the session.<\/p>\n
All analysis was done by Ms Santi using A-weighted decibels of the sound data, which is adjusted to focus on frequencies that the human ear is most sensitive to. She divided the recordings into one-hour segments, analysed the hourly average decibel levels and provided data for plotting the decibel level graphs. She also isolated louder sound events and processed their psychoacoustic values.<\/p>\n<\/div>\n