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2. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Industrial noise control is a subset of interior architectural control of noise, with emphasis on specific methods of sound isolation from industrial machinery and for protection of workers at their task stations. Sound masking is the active addition of noise to reduce the annoyance of certain sounds, the opposite of soundproofing.

3. 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.

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. How to Reduce Noise Pollution in Your Yard

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

   Several "green" solutions exist that, when combined, can reduce the perception of noise. Here are some things you can do. Show comments. Advertisement. Advertisement. Holiday Shopping Guides.

6. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   The Outdoor–Indoor Transmission Class (OITC) is a standard used for indicating the rate of sound transmission from outdoor noise sources into a building. It is based on the ASTM E-1332 Standard Classification for Rating Outdoor-Indoor Sound Attenuation. [ 37 ]

7. Background noise - Wikipedia

   en.wikipedia.org/wiki/Background_noise

   Background noise is an important concept in setting noise levels. Background noises include environmental noises such as water waves , traffic noise , alarms , extraneous speech , bioacoustic noise from animals, and electrical noise from devices such as refrigerators , air conditioning , power supplies , and motors .