Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Sound absorption coefficients of specimens

From: Effect of heat treatment temperature and time on sound absorption coefficient of Larix kaempferi wood

Temperature/time	Frequency
Temperature/time	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
Control	0.024	0.034	0.012	0.012	0.028
200 °C
9 h	0.026	0.033	0.013	0.014	0.030
12 h	0.025	0.034	0.014	0.017	0.031
15 h	0.026	0.034	0.014	0.017	0.031
18 h	0.027	0.036	0.015	0.020	0.032
220 °C
9 h	0.027	0.034	0.012	0.019	0.031
12 h	0.027	0.036	0.014	0.022	0.034
15 h	0.028	0.037	0.015	0.025	0.035
18 h	0.028	0.036	0.016	0.028	0.037
240 °C
9 h	0.027	0.036	0.014	0.022	0.034
12 h	0.028	0.036	0.016	0.026	0.039
15 h	0.027	0.034	0.016	0.030	0.043
18 h	0.028	0.036	0.017	0.035	0.045

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