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2. Acoustic plaster - Wikipedia

   en.wikipedia.org/wiki/Acoustic_plaster

   A first finishing layer is then applied on top of the substrate panels, and sometimes a second finishing layer is added for greater sound attenuation. Pre-made acoustic panels are more commonly used, but acoustic plaster provides a smooth and seamless appearance, and greater flexibility for readjustment.

3. 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 ...

4. Wall panel - Wikipedia

   en.wikipedia.org/wiki/Wall_panel

   A wall panel is single piece of material, usually flat and cut into a rectangular shape, that serves as the visible and exposed covering for a wall. Wall panels are functional as well as decorative, providing insulation and soundproofing , combined with uniformity of appearance, along with some measure of durability or ease of replaceability.

5. Noise reduction coefficient - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction_coefficient

   A reverberation chamber is used to test the sound absorption coefficients and NRC of a material. The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency ...

6. Noise barrier - Wikipedia

   en.wikipedia.org/wiki/Noise_barrier

   The sound tube in Melbourne, Australia, designed to reduce roadway noise without detracting from the area's aesthetics.. 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.

7. Sound reduction index - Wikipedia

   en.wikipedia.org/wiki/Sound_Reduction_Index

   The sound reduction index is used to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator. It is defined in the series of international standards ISO 16283 (parts 1-3) and the older ISO 140 (parts 1-14), or the regional or national variants on these standards.