Figure 9
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SPL spectrogram showing the presence of AM of multiple tones on 2022/03/26 and 2022/03/27. AM can be identified by horizontal lines around the carrier tone spaced at the BPF (modulation frequency). (a) Wind farm location, (b) outside the building at 1 km distance, (c) and (d) detected AM samples for rated rotational speed of WT 2 at the wind farm and building location.
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