Abstract
In a previous paper, a technique was described for rating floors for impact-sound insulation by subjective observations of the level of tailored random noise required to mask transmitted footsteps. The objective was to compare subjective ratings with impact machine ratings. The initial study was done on variations of a reinforced concrete-slab floor under laboratory conditions. Further observations have now been made in typical buildings, with special emphasis on wood-joist floors. For the whole study, the correlation between subjective ratings and machine ratings is poor if the FHA type of reference contour is used. The effect of this contour is to make the results, especially for concrete floors, quite dependent on the high-frequency noise produced by the machine. A better correlation is obtained by altering the present FHA reference contour to a flat one, thus reducing the emphasis on high frequencies.
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