[Retracted] Ecological Adaptability and Application of Traditional Historical Buildings under the Background of Environmental Protection

Table 4

Cave acoustic environment.

	Transformation of the former	After transformation
Background noise (dB)	27.3∼30.2	27.3∼29.4
Noise when no one speaks (dB)	24.3∼31.8	33.3∼39.5
Noise when someone is talking (dB)	24.1∼54.5	43.2∼53.1