Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An anechoic chamber is a room designed to stop reflections of either sound or electromagnetic waves. They are also insulated from exterior sources of noise. The combination of both aspects means they simulate a quiet open-space of infinite dimension, which is useful when exterior influences would otherwise give false results. Anechoic chambers were originally used in the context of acoustics (sound waves) to minimize the reflections of a room. Their radiofrequency counterpart have also been in use for a few decades, for example to test antennas, radars, or electromagnetic interference.

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