Abstract
This paper describes a procedure for calculating the impact-noise level of the sound that would be radiated by a bare, stiff structural floor into the reverberant receiving room below, when excited with a standard tapping machine. Calculations are also given for the improvement in impact noise isolation achieved by adding: (a) an elastic surface layer, (b) a locally reacting floating floor, and (c) a resonantly reacting floating floor, to the structural floor.
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