Amsterdam has started the fight against noisy motorcycles and cars. On Friday, the city placed electric road signs in two places to warn road users if their vehicles are too loud. The warnings will eventually be replaced by “noise cameras,” which, like speed cameras, automatically send a fine to the offending driver, Parool reports.
Many of them in a grid.
One microphone would be like having 1 ear. If you’ve ever known someone who is deaf in 1 ear, they have trouble locating the direction sounds come from. IIRC, the implementation involves something like ~50—100 or so microphones. If you have a lot of noise entering your house you can point the thing towards a window and it will generate a heat map image showing red color where the noise is the highest.