Untersuchungen über den Verlauf der Sollkurve fur den Trittschallschutz im Wohnungsbau

The results are communicated here on the frequency analysis of the usual impact noises in houses. In considering the calculated disturbing effects of different kinds of noise a “mean disturbing dwelling noise” will be defined in this report and it will be given in the form of a temporary constant sound level curve for every third octave band. Another work [6] has given the form of the curve of an “acceptable noise”, which one can regard as the curve of the acceptable value for the usual impact noises in houses. By comparison of the usual impact noises in houses (“mean disturbing dwelling noise”) with the noise of standard impact generators one can derive an optimum form of theoretical curve for the normal impact noise level.

This theoretically determined curve shows in comparison, that a theoretical curve (DIN-Soll curve) for low and middle frequencies has smaller impact noise level and a bigger impact noise level on higher frequencies. In comparing the measure of protection determined from impact noise obtained through the means of the two theoretical curves, for different ceilings with the loudness levels of the usual impact noises in dwellings obtained by calculation or through subjective measurements, it will be apparent that the impact noise damping from the theoretical curve derived here will be in marked better agreement with the subjective effect of a barrier than is the case of the DIN theoretical curve. This latter computes the high frequencies too strongly and as a result grades rough ceilings generally incorrectly. It follows that the measures taken for improvement which are only effective at high frequencies, and consequently do not generally diminish in practice the usual impact sound noises in dwellings are considered as real improvements in lessening noise according to the DIN theoretical curve. This mistake is avoided by using the curve derived in this paper.