Auditory experiment for classification scheme on rubber ball impact sound

摘要

Classification scheme for dwelling is standardizing in ISO/TC 43/SC 2. Airborne sound insulation, light-weight impact sound and building equipment noise level were classified as 6 classes; A~F. However, classification scheme for low frequency impact sound using rubber ball which was standardized in ISO 10140 series and ISO 16283-2 was not proposed. In order to propose classification scheme for rubber ball impact sound, auditory experiments was conducted. The auditory experiment was designed with different background noise level. The effect of background noise on the subjective response was about 3.3 dB. Subjects' responses to the task, such as surfing the Internet, were about 1.5 dB less sensitive. The task effect was larger when the presented rubber ball impact sound level was higher and the task effect was smaller when the rubber ball impact level was lower. The level of rubber ball impact sound for class D, which corresponds to the performance rating of the newer building construction, is about 53 dB in L_(A,Fmax) when background noise is taken into consideration. In order to propose classification scheme for rubber ball impact sound, it is necessary to consider the synthesis of the results of various subjective experiments, the level distribution of rubber ball impact sound level in a various apartment buildings with different structural system, and the state of technology development.