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2. 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 rich people from noise pollution. Noise barriers are the most effective method of mitigating roadway , railway, and industrial noise sources – other than cessation of the source activity or use ...

3. How to Reduce Noise Pollution in Your Yard

   www.aol.com/news/2010-05-27-how-to-reduce-noise...

   As suburban sprawl continues and traffic demands increase everywhere, more homeowners are faced with an annoying byproduct: noise. But there are numerous ways to fight noise. We'll start with your ...

4. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Highway noise is today less affected by motor type, since the effects in higher speed are aerodynamic and tire noise related. Other contributions to the reduction of noise at the source are: improved tire tread designs for trucks in the 1970s, better shielding of diesel stacks in the 1980s, and local vehicle regulation of unmuffled vehicles. [13]

5. Perimeter fence - Wikipedia

   en.wikipedia.org/wiki/Perimeter_fence

   In high-security applications, sensors may be attached to the fence that generate alarms when they detect someone cutting, climbing, or lifting the fence fabric. The goal of perimeter fence. The goal of perimeter fence is to stop or prevent the incident and reduce the level of risk. Doing so discourages the perpetrator from committing a harmful ...

6. Acoustical engineering - Wikipedia

   en.wikipedia.org/wiki/Acoustical_engineering

   Noise control is a set of strategies to reduce noise pollution by reducing noise at its source, by inhibiting sound propagation using noise barriers or similar, or by the use of ear protection (earmuffs or earplugs). [20] Control at the source is the most cost-effective way of providing noise control.

7. 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 ...