Tuning of Estimated Sound Absorption Coefficient of Materials of Reverberation Room Method

Table 3

SAC measurement results of the impedance tube method and reverberation room method.

Sound absorption coefficient
Frequency	48K25		96K25		32K50		73K50
	Impedance tube method	Reverberation room method	Impedance tube method	Reverberation room method	Impedance tube method	Reverberation room method	Impedance tube method	Reverberation room method
100	0.00	0.04	0.01	0.04	0.05	0.11	0.07	0.10
125	0.03	0.11	0.05	0.10	0.09	0.23	0.11	0.21
160	0.04	0.11	0.05	0.09	0.10	0.30	0.16	0.32
200	0.05	0.17	0.07	0.18	0.14	0.40	0.22	0.45
250	0.08	0.24	0.11	0.26	0.19	0.53	0.30	0.62
315	0.09	0.30	0.15	0.35	0.22	0.74	0.39	0.82
400	0.13	0.37	0.22	0.48	0.35	0.92	0.44	1.04
500	0.19	0.50	0.25	0.67	0.47	0.96	0.65	1.08
630	0.25	0.60	0.42	0.85	0.64	1.00	0.81	1.06
800	0.33	0.82	0.57	0.94	0.78	1.04	0.86	1.01
1000	0.42	0.84	0.68	0.91	0.88	0.96	0.85	0.96
1250	0.53	0.80	0.77	0.90	0.90	0.96	0.82	0.92
1600	0.67	0.81	0.89	0.95	0.88	0.93	0.74	0.92
2000	0.77	0.83	0.94	0.96	0.89	0.83	0.75	0.87
2500	0.90	0.78	0.98	0.95	0.93	0.85	0.81	0.89
3150	0.97	0.84	0.98	0.87	0.98	0.84	0.90	0.88
4000	1.00	0.81	0.96	0.86	0.98	0.86	0.92	0.84
5000	0.97	0.77	0.94	0.86	0.85	0.84	0.68	0.84