Human response to air source heat pump noise: influence of background noise, operating conditions and acoustic characteristics

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Table B.3.

Mean Roughness, Tonality and Fluctuation Strength characteristics of each operating condition under 31 dB(A) (night) and 39 dB(A) (day) background noise. Conditions at the top four rows are found in Part 2, while the rest are found in Part 1. Metrics calculated from stimuli after outdoor-to-indoor propagation filtering and at the listener position.

Operating condition	Background noise	Roughness (asper)			Tonality (tuHMS)			Fluctuation strength (vacil)
		R95	R5	Avg.	T95	T5	Avg.	F95	F5	Avg.
MaxToMin	31 dB(A)	0.021	0.202	0.084	0.007	0.232	0.075	0.001	0.011	0.003
MinToMax	31 dB(A)	0.022	0.232	0.079	0.005	0.381	0.102	0.001	0.023	0.003
Stationary	31 dB(A)	0.033	0.115	0.064	0.006	0.368	0.084	0.001	0.005	0.003
Control (P2)	31 dB(A)	0.014	0.033	0.022	0.005	0.056	0.029	0.001	0.003	0.002
Minimum	31 dB(A)	0.021	0.271	0.079	0.006	0.198	0.069	0.001	0.039	0.005
Moderate	31 dB(A)	0.032	0.215	0.106	0.006	0.235	0.084	0.001	0.042	0.005
Maximum	31 dB(A)	0.028	0.114	0.063	0.006	0.439	0.098	0.001	0.041	0.005
Control (P1)	31 dB(A)	0.014	0.032	0.022	0.005	0.054	0.028	0.001	0.022	0.003
Minimum	39 dB(A)	0.024	0.223	0.067	0.006	0.165	0.054	0.001	0.039	0.005
Moderate	39 dB(A)	0.026	0.185	0.082	0.006	0.196	0.062	0.001	0.043	0.005
Maximum	39 dB(A)	0.033	0.131	0.065	0.005	0.466	0.124	0.001	0.041	0.005
Control (P1)	39 dB(A)	0.023	0.056	0.038	0.008	0.080	0.041	0.001	0.028	0.004

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