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2. Infrasound - Wikipedia

   en.wikipedia.org/wiki/Infrasound

   Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. Although the ear is the primary organ for sensing low sound, at higher intensities it is possible to feel infrasound vibrations in various parts of the body.

3. Electric acoustic stimulation - Wikipedia

   en.wikipedia.org/wiki/Electric_acoustic_stimulation

   The parallel processing of these signals, however, is performed separately and optimized for both acoustic hearing (focusing on low-frequency hearing) and cochlear implant stimulation (focusing on high-frequency hearing). The hearing aid is integrated in the ear hook and the amplified signals are forwarded to the auditory pathway via an ear mould.

4. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...

5. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...

6. The Hum - Wikipedia

   en.wikipedia.org/wiki/The_Hum

   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.

7. 7 Best Invisible Hearing Aids In 2025 - An Audiologist's Guide

   www.aol.com/7-best-invisible-hearing-aids...

   The Soundly team spends hundreds of hours per month researching and reviewing hearing aids. These are the best invisible hearing aids on the market. 7 Best Invisible Hearing Aids In 2025 - An ...

8. The 6 Best Sound Machines for a Restful Night's Sleep - AOL

   www.aol.com/6-best-sound-machines-restful...

   Evo. Close to 8,000 Amazon customers are loving this device to fall and stay asleep. Choose between 10 white, pink, and brown noise variations, along with two ocean- and 10 additional fan options ...

9. Hearing aid - Wikipedia

   en.wikipedia.org/wiki/Hearing_aid

   Such signal processing includes feedback management, wide dynamic range compression, directionality, frequency lowering, and noise reduction. Modern hearing aids require configuration to match the hearing loss, physical features, and lifestyle of the wearer. The hearing aid is fitted to the most recent audiogram and is programmed by frequency.