Abstract
The relative variance observed in power measurement data when using reverberation rooms is analyzed, based on modal wave theory. It is well known that a biased error due to room variance is contained in power measurement data from the power output of a source in a free field. It is demonstrated numerically and theoretically that the biased error can be reduced by increasing the modal overlap in the room. Thus, the reverberation time should be shorter than approximately 3·0 s at a center frequency of 125 Hz, in order to make power measurements which meet the ISO specifications of a reverberation room whose volume is 200 m 3.
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