This study investigated the relation between annoyance and single-number quantities to rate heavy-weight floor impact sound insulation. Laboratory experiments were conducted to evaluate the subjective response of annoyance resulting from heavy-weight floor impact sounds recorded in wooden houses. Stimuli had two typical spectra and their modified versions, which simulate the precise change in frequency response resulting from insulation treatments. Results of the first experiment showed that the Zwicker's percentile loudness (N(5)) was the quantity to rate most well annoyance of heavy-weight impact sound over a wide sound level range. The second experiment revealed that arithmetic average (L(iFavg,Fmax)) of octave-band sound pressure levels measured using the time constant "fast" and Zwicker's percentile loudness (N(5)) much better described annoyance by the precise change in the sound spectrum attributable to insulation treatments than Japanese standardized single-number quantities (L(i,Fmax,r), L(iA,Fmax), and L(i,Fmax,Aw)) do. Japanese standardized single-number quantities using the A-weighting curve as a rating curve were found to be excessively influenced by the 63 Hz octave-band sound level and have the great sound level-dependences in the relation with subjective ratings.

No abstract

No abstract

National Institute for Land and Infrastructure Management 本稿の一部は既発表論文 5),6) を加筆・修正したものである。 V3-1(16Hz) V3-1(50Hz) V3-2(25Hz) 注：白抜きはケース6(人6名)を示す

JIS A 1418-2 standardized two heavy=soft impact sources, "car-tire source" and "rubber ball source", for measurement of the heavy-weight floor impact sound. The rubber ball source is defined in ISO 140-11. The impact force and frequency characteristic differ between the car-tire source and the rubber ball source. Therefore, the effect of change in impact force due to heavy-weight impact sound was investigated in two types of construction. Moreover, the changes in impact characteristic of two heavy=soft impact sources by changing the drop height were measured. It is indicated that there is linearity in the drop height of two heavy=soft impact sources and the impact force exposure level. However, the correspondence between the impact exposure level and the heavy-weight floor impact sound pressure level using the car-tire source is low for the wood-frame construction. V C 2011 Institute of Noise Control Engineering.