Statistical acoustics: The main research wavelength is very small (compared with space or object). There are many normal vibration modes in a certain frequency range. When the frequency distribution is very dense, the phase relationship is neglected, and only the energy addition relationship of each simple mode is considered. . The Sabin formula can be derived using statistical acoustic methods. Statistical acoustic methods are not limited to use in closed or semi-closed spaces. In acoustic wave transmission, statistical energy technology solves many problems, which is an example.
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