The canterbury sound-proof room

Abstract
The room described was carefully designed to provide maximum attenuation and absorption in the middle (speech) frequency range. The construction was based upon the principles outlined by Richardson (1945). It has a mean ambient noise level of 29.9 db. on the A‐ weighting of a Dawe 1400 E sound level meter. The theoretical reverberation time of the room is 0.76 secs. The authors suggest that any further reduction in the noise level would be unwarranted because of sensory deprivation effects.

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