Abstract
The sufficient frequency range to be measured for the rating of impact sound insulation of floors has been a relevant research question since the 1960's when the lower limit of the measured frequency range was set at 100 Hz. It has been long recognized that walking sounds at frequencies lower than 100 Hz might have a significant effect on the experienced impact sound insulation of floors. Recently, it has been suggested that the frequency range to be measured for the rating of impact sound insulation should be enlarged down to 20 Hz. This suggestion is based on studies concerning wooden buildings. It is not known whether such low-frequency walking sounds are generated by walking on concrete floors. The purpose of this preliminary study was to produce sound spectra of several living impact sound sources. The spectra of different sound sources were measured in a laboratory. The results show that, in the case of concrete floors, such low-frequency living sound spectra that would exceed the hearing threshold do not exist, or they are at least uncommon.
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