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Sound Transmission Through Partitions
Part 1: The theory originally developed by London and Beranek concerning diffuse source field and transmission between rooms included both direct and reverberant field contribution inthe receiving space. The direct field component was calculated by assuming that a receiver was located near the radiating surface. Since a receiver may not be simultaneously close to all radiating surfaces at once, the theory is consistent for multiple-path transmission. By taking into account the falloff of the direct field, a formulation can be determined which allows for both self-consistency and an extension of the theory to radiation from buildings to exterior environment.: : Part 2: A theory of the transmission of direct field sound into an enclosed space must account for the current diffuse field means of measuring transmission loss. A methodology is set out for calculating the sound level in rooms which accounts for this difference as well as the angular dependence on source position. The methodology can be extended to full and partial line sources.
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