This paper describes the basic study on unknown structure-bone sound generated in buildings. In the early investigation of these impact sounds, the cause of generation was related to the repeated friction motion at the concrete beam joint induced by the thermal stress of the sunshine (Generation and the measures of impact sound by stick-slip phenomenon at beam joint in buildings (the first report), Meeting of the Acoustical Society of America, June, 2007). In this study, many kinds of data of the impact sound and vibration had been gathered and more investigation was carried out. The typical impact sound and vibration and their frequency characteristics were discussed in detail based on the hypothesis that most of the causes of the generation of unknown sound in buildings depends mainly on the stick-slip phenomenon.
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