anechoic chamber

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Noun1.anechoic chamber - a chamber having very little reverberation
room - an area within a building enclosed by walls and floor and ceiling; "the rooms were very small but they had a nice view"
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Panels were installed in an opening of a wall separating between a reverberation room and an adjacent small semi anechoic room. The reverberation room was used as the source room with speaker system generating broad band white noise.
We tested the sound pressure frequency of the loudspeaker by taking measurements in a reverberation room and an anechoic room, in accordance with the standards established in JIS Z 8732.
The behavior of female medflies was observed in an anechoic room with a controlled atmosphere.