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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. 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.

4. 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 ...

5. Adaptive noise cancelling - Wikipedia

   en.wikipedia.org/wiki/Adaptive_noise_cancelling

   Adaptive noise cancelling is an unorthodox signal processing technique that is highly effective in suppressing additive interference or noise corrupting a received target signal at the main or primary sensor in certain common situations where the interference is known and is accessible but unavoidable and where the target signal and the interference are unrelated, that is, uncorrelated.

6. Don’t put your bare feet on another passenger’s armrest - AOL

   www.aol.com/news/don-t-put-bare-feet-060003035.html

   Earbuds and noise-canceling headphones are a double-edged sword: great for blocking out the world when it’s intrusive, but not so great for paying attention when it matters.

7. 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.