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The Hum is persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported in many countries, including the United States, the United Kingdom, Australia and Canada.
And ELFs – extremely low frequency waves that are used to communicate with submarines – have led to theories that the Hum is the accidental by-product of military technology.”
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.
The Hum – an apparently widespread phenomenon involving a low-frequency hum of unknown origin, inaudible to most people; Mains hum – an electric or electromagnetic phenomenon that causes a low frequency (50 or 60 Hz) audible signal
What’s causing the hum? A local government’s lengthy investigation struggled to find answers. Skip to main content. News. Search. Need help? Call us! 800-290-4726. Login / Join. Mail ...
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.
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.
Low-frequency noise of motorised boats appears to disrupt the acoustic behaviour, including the clicks and buzzes, the dolphins use to find prey. Show comments. Advertisement. Advertisement.