A room acoustic calibration method for vanished architectural spaces using archival sound: A case study of the Bürgerbräukeller (1885–1979)

Open Access

Table 2.

Absorption coefficients, char_depth (c d, mm) as the single value using equation (1), and associated surface area (m²) in the calibrated GA model. † have defined scattering coefficients of [30%,40%,50%,60%,70%,80%]. When no final absorption coefficients are depicted, they were left unchanged during the calibration.

		125	250	500	1k	2k	4k	cd	Area
Audience	min.	0.39	0.49	0.61	0.67	0.73	0.79	†	2584
	max.	0.49	0.59	0.71	0.77	0.83	0.89	†
	ini.	0.44	0.54	0.66	0.72	0.78	0.84	†
	fin.	0.41	0.51	0.63	0.72	0.75	0.89	†
Floor	min.	0.10	0.09	0.04	0.03	0.03	0.03	10	1504
	max.	0.20	0.16	0.15	0.12	0.11	0.11	20
	ini.	0.15	0.11	0.10	0.06	0.05	0.10	10
Plaster	min.	0.01	0.02	0.03	0.04	0.05	0.06	20	1491
	max.	0.35	0.19	0.14	0.11	0.10	0.15	60
	ini.	0.28	0.14	0.09	0.06	0.05	0.10	40
	fin.	0.03	0.04	0.05	0.05	0.05	0.10	60
Stucco	min.	0.01	0.01	0.01	0.02	0.02	0.02	50	912
	max.	0.04	0.04	0.05	0.06	0.06	0.07	150
	ini.	0.02	0.02	0.03	0.04	0.04	0.05	100
Glass	min.	0.03	0.02	0.02	0.01	0.01	0.01	20	194.4
	max.	0.06	0.04	0.03	0.02	0.02	0.02	60
	ini.	0.06	0.04	0.03	0.02	0.02	0.02	40
Banners	min.	0.10	0.30	0.50	0.65	0.70	0.75	10	117.1
	max.	0.30	0.50	0.70	0.85	0.90	0.95	20
	ini.	0.20	0.40	0.60	0.75	0.80	0.85	10

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