Anechoic Environment

Anechoic Environment Literally, without echo. An anechoic situation exists with acoustic signals produced by a source are not reflected back to it. Because the ground is reflective, true anechoic conditions would only exist outdoors and at a fairly high altitude. Anechoic chambers that have special acoustic materials on the walls to absorb reflections, are only that way down to lower-midrange frequencies. Howard Ferstler