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It was around 2005 that Simon Payne started hearing it. A strange, low, rumbling sound that travels through walls and floors and seems to come from everywhere.
The hum was louder inside their house than out, in part, they believed, because their house vibrated in resonance to the 60 Hz hum. In the lawsuit they claimed that the volume of the hum was measured at up to 64.1 dB in the couple's home.
The report "A Review of Published Research on Low Frequency Noise and its Effects" [54] contains a long list of research about exposure to high-level infrasound among humans and animals. For instance, in 1972, Borredon exposed 42 young men to tones at 7.5 Hz at 130 dB for 50 minutes.
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The phenomenon is also called audible magnetic noise, [1] electromagnetic acoustic noise, lamination vibration [2] or electromagnetically induced acoustic noise, [3] or more rarely, electrical noise, [4] or "coil noise", depending on the application.
Such pulse-frequency modulation allows the stimulus analysis to be independent of the peripheral tuning of the basilar membrane or the hair cells, which is already poor at low auditory frequencies. [17] Unlike other acoustic fibers, infrasonic fibers do not show any indication of being tuned to a particular characteristic frequency. [17]
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