Noise control: sound wave system cancels out drum of traffic

Windows can stay open say scientists behind speaker array that emits opposing pressure sound waves to counteract din

If the hum of passing cars and the clatter of trains drives you to slam windows shut on a hot day, a new noise cancelling system could be music to your ears.

Scientists have developed a sound control system that can be fitted on to an open window, allowing a breeze to waft in while sounds from outside are quietened.