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A comparison of inaudible windfarm noise and the natural
environment noise whilst monitoring brainwaves and heart
rateSteven Cooper
23rd International Congress on Acoustics
• Sound system calibrated to playback 3-min sample of Cape Bridgewater Windfarm in bedroom (Signal 1) at same level as measured in the field
• 3-min samples of other noise sources normalised to have the same A-weighted Leq level as Cape Bridgewater Windfarm signal
• Playback of all signals were inaudible in the two rooms
Signal No. Description
1 Cape Bridgewater House 87 Bedroom
2 Bawley Point Surf Noise
3 Capital Windfarm
4 Taralga Windfarm
5 Capital Windfarm
6 Coal Mine Ventilation Fan
7 White Noise
Listening Room
Hemi-anechoic Room
Bawley Point Surf Noise Measurement
Listening Room
Hemi-anechoic Room
Conclusion
• Inaudible noise
• Direct response of brain – no thought process
• Promising – worthy of further study• Need for longer samples• Suggest one source at a time minimum 20 min exposure• Minimum break between tests 30 mins
• Is the real amplitude modulation in the low frequency that gives rise to the greatest effect?
• But why then a greater change in the standard deviation for the hemi-anechoic room? Smaller room or full spectrum?
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