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The theory of steady-state sound field in a room is re-examined. It is shown that the normal-mode solution of the wave equation is not the exact solution, and the derivation is incorrect... The exact solution of the wave equation in a reflective room should contain both the free space solution (direct sound field) and the standing wave solution (reverberant sound field), the latter is formed by all the reflected waves to a group of allowed wave types (the normal modes of vibration ).
The theory of steady-state sound field in a room is re-examined. It is shown that the normal-mode solution of the wave equation is not the exact solution, and the derivation is incorrect ... The exact solution of the wave equation in a reflective room should contain both the free space solution (direct sound field) and the standing wave solution (reverberant sound field), the latter is formed by all the reflected waves to a group of allowed wave types (the normal modes of vibration) .