Researchers in Singapore developed a system that’s sort of like noise-canceling headphones for your whole apartment. Car alarms, jackhammers, a drunken argument and the rumble of the No. 7 train passing overhead.
https://www.nytimes.com/2020/07/11/science/windows-street-noise.html
https://www.nytimes.com/2020/07/11/science/windows-street-noise.html