What is an anechoic chamber?

Anechoic chamber is a room with special walls that absorb as much sound as possible. anechnoic means "without echo". Sometimes the whole room even rests on shock absorbers and negates any vibrations from the rest of the building or from outside. Their special shape reflects the energy into the top of the wedge and distracts it as a vibration in the material rather than in the air. Anechoic chambers are often used to test microphones, measure the exact acoustic properties of different tools, precisely determining how much energy is transmitted in electroacoustic devices and performs fine psychoacoustic experiments. It is closed in more than a meter of concrete to protect it from an external reempter. Its creators boasted that the chamber absorbs over 99.995% of incident acoustic energy over 200 Hz. The wedge -shaped panels are poor in the absorption of lower frequencies, but these frequencies bear low energy and are inaudible to human ears. Murray Hill Chamber received the Guinness Book of World Records in one placefor the quietest room in the world.

John Cage, a famous experimental composer, was inspired when he entered the Harvard Anechoic chamber at the age of 40 and heard the sound of his own blood. In the end, he composed a three-minute piece that consisted of nothing but silence to allow viewers to think about the reality that no man was able to escape the noise-probably the deaf with an exception.

Special anechoic chambers are also designed to test various electromagnetic devices. Different shaped wedges allow the reflection of different frequencies such as radio.

Research in anechoic chambers on specific ways in which the human head reflects sound energy has led to the development of speakers that project virtual sound around the listener. These speakers use the way we hear the sound to make us think that it comes from one direction whenIt really comes from another. One day it could be possible to simulate entire orchestras with only a few speakers.