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The tapping sound of wood, which included sitka spruce and maple used for musical instruments, and isotropic materials was analyzed into power spectra every one milliseconds and their transient characteristics were investigated. The variations of 1/3-octave band power spectra with time were visualized in three dimensions. The rise time Tr and the decrement rate were investigated at each 1/3-octave band. The Tr decreased rapidly with increasing frequencies up to the first mode resonancedoi:10.1250/ast.20.117 fatcat:mbpyjqctxncrdfjgfrt2kor6p4