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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

3. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   Soundproofing is any means of impeding sound propagation.There are several basic ways to reduce sound: increasing the distance between 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 active antinoise sound generators.

4. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Noise control or noise mitigation is a set of strategies to reduce noise pollution or to reduce the impact of that noise, whether outdoors or indoors. Overview [ edit ] The main areas of noise mitigation or abatement are: transportation noise control, architectural design, urban planning through zoning codes , [1] and occupational noise control.

5. Acoustic quieting - Wikipedia

   en.wikipedia.org/wiki/Acoustic_quieting

   Acoustic quieting. Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching an observer. Machinery vibrates, causing sound waves in air, hydroacoustic waves in water, and mechanical stresses in solid matter. Quieting is achieved by absorbing the vibrational energy or minimizing the source ...

6. The 8 best OTC hearing aids for seniors, according to ... - AOL

   www.aol.com/lifestyle/best-otc-hearing-aids...

   Best sound quality. $1,098 at Amazon. Audien ATOM PRO 2. Best ease of use. $289 at Amazon. See 3 more. While there is no way to reverse hearing loss, hearing aids can still enhance our everyday ...

7. Noise barrier - Wikipedia

   en.wikipedia.org/wiki/Noise_barrier

   A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution. Noise barriers are the most effective method of mitigating roadway, railway, and industrial noise sources – other than cessation of ...