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2. The Hum - Wikipedia

   en.wikipedia.org/wiki/The_Hum

   Industrial-facilities mechanical engineer Steve Kohlhase spent $30,000 on legal fees and equipment related to his independent investigation of the low-frequency hum. [19] Garret Harkawiks' 2019 documentary film Doom Vibrations focused on Kohlhase's ten year journey to figure out what was causing the noise, and his theory behind it. [ 20 ]

3. Mains hum - Wikipedia

   en.wikipedia.org/wiki/Mains_hum

   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 .

4. ‘It brought me to my knees’: The Hum – a mysterious ...

   www.aol.com/brought-knees-hum-mysterious...

   “It’s not a tinnitus-type noise. It’s a low-frequency pulsating. It’s very pervasive. And no matter what you do, you cannot block it out. The difficulty is, nobody’s actually managed to ...

5. Infrasound - Wikipedia

   en.wikipedia.org/wiki/Infrasound

   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.

6. A Ghostly Nighttime Hum Is Invading Random Towns ... - AOL

   www.aol.com/lifestyle/ghostly-nighttime-hum...

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7. A mysterious, low hum has plagued a UK village for years ...

   www.aol.com/news/mysterious-low-hum-plagued-uk...

   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 ...

8. Electromagnetically induced acoustic noise - Wikipedia

   en.wikipedia.org/wiki/Electromagnetically...

   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.

9. Audio noise measurement - Wikipedia

   en.wikipedia.org/wiki/Audio_noise_measurement

   Microphones, amplifiers and recording systems all add some electronic noise to the signals passing through them, generally described as hum, buzz or hiss. All buildings have low-level magnetic and electrostatic fields in and around them emanating from mains supply wiring, and these can induce hum into signal paths, typically 50 Hz or 60 Hz (depending on the country's electrical supply standard ...