Anechoic means "without echo, that is to say that seeks to eliminate in such a room sound reflections on walls (with sound-absorbing materials). This is useful when you want to measure the sound produced by a machine, be it a vacuum cleaner, a speaker or a jet engine. So there are rooms of very different sizes as needed.
This (small) room is equipped with a sphere of speakers to measure the perception of directional sound. Experience
basic: It sends sound to 100 degrees away and right, then at 100 ° front and right, to a subject in the center. The subject is asked from where the sound perceived. From these responses, we can deduce that ear not able to know if a sound is coming from in front or behind. The brain deducted by the cons of the situation experienced, and most people are satisfied they hear if the sound is coming from in front or behind, it's psycho-acoustics.
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