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[Category : - Construction Processes & Equipment- MECHANICAL ENGINEERING]
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ON This invention relates to a single or multilayer sound transmission board for use in the construction of the partition walls, ceilings or floors of buildings and as a soundproof panel for aircraft engines or any place where noise reduction is required. A multilayer composite board (10) comprises layers (11) whose thickness determined by convergence of two functional dependencies of a weighted sound reduction index Rx or sum of Rx and spectrum adaptation term Ctr from the surface mass and the critical frequency, wherein the critical frequency of the layer equals to or exceeds the threshold of 4000 Hz. The layers of the multilayer board are lightly fixed together mechanically by screws or by gaskets or suitable adhesive materials, providing layer by layer sound wave propagation through the board. 25 25 26 25 Figure 2

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