A room which creates free field conditions but above a reflective plane.Above a certain frequency all sound waves that hit the walls or ceiling of the chamber will be absorbed.
This type of chamber is normally used in vehicle testing with a rolling round so that the vehicle may be driven. The semi-anechoic chamber then forms a controlled environment with the surrounding acoustic conditions behaving as a sterile version of the real world. In this way accurate measurements of the sound inside and outside the vehicle can be made under operating conditions.
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