An anechoic chamber is a room designed to stop reflections or echoes of either sound or electromagnetic waves. They are also often isolated from energy entering from their surroundings. This combination means that a person or detector exclusively hears direct sounds, in effect simulating being outside in a free field. https://www.ecotone.in/anechoic-chambers/ Acoustic Anechoic C... https://www.ecotone.in/anechoic-chambers/