23rd International Congress on Acoustics A comparison of in inaudible windfarm noise and the natural environment noise whilst monitoring brainwaves and heart rate Steven Cooper
• 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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