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A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...
Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
The torsional deflection of a simple cylinder cannot radiate efficiently acoustic noise, but with particular boundary conditions the stator can radiate acoustic noise under torque ripple excitation. [8] Structure-borne noise can also be generated by torque ripple when rotor shaft line vibrations propagate to the frame [9] and shaft line.
A woman noticed a "weird noise" coming from a tiny hole in her apartment. It turned out to be a familiar friend. Woman discovers source of 'weird noise' in her wall: 'I had the exact same happen ...
Former president Donald Trump faced online mockery after making a series of strange grunting and moaning noises during his speech at the Oakland County Republican Party Lincoln Day Dinner.
Videos of eerie noises erupting from the skies have recently surfaced on YouTube, sending people into a panic around the world. The video above shows a particularly frightening episode of this ...
The human brain evolved to recognize patterns, and if a person listens to enough noise the brain will detect words, even when there is no intelligent source for them. [48] [49] Expectation also plays an important part in making people believe they are hearing voices in random noise. [50] Apophenia is related to, but distinct from pareidolia. [51]
Nasa says that “strange” noises heard coming from the troubled Boeing Starliner spacecraft are not an indicator that its crew are in any danger.. The unusual noises have now stopped and were ...