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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. Noise curve - Wikipedia

    en.wikipedia.org/wiki/Noise_curve

    Noise curves are a common way to characterise background noise in unoccupied buildings and spaces. [1] Their purpose is to produce a single-value representation of a complete sound spectrum. International standards organizations ( ISO , [ 2 ] ANSI [ 3 ] and ASA ) recognize the need to objectify judgements on the amount of ambient noise in ...

  4. Noise temperature - Wikipedia

    en.wikipedia.org/wiki/Noise_temperature

    is the noise temperature (K, kelvin) Thus the noise temperature is proportional to the power spectral density of the noise, /. That is the power that would be absorbed from the component or source by a matched load. Noise temperature is generally a function of frequency, unlike that of an ideal resistor which is simply equal to the actual ...

  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 reduction index - Wikipedia

    en.wikipedia.org/wiki/Sound_Reduction_Index

    The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...

  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 ...

  8. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    Outside the US, the ISO Sound Reduction Index (SRI) is used. The STC rating very roughly reflects the decibel reduction of noise that a partition can provide. The STC is useful for evaluating annoyance due to speech sounds, but not music or machinery noise as these sources contain more low frequency energy than speech. [1]

  9. Noise pollution - Wikipedia

    en.wikipedia.org/wiki/Noise_pollution

    The CityLink sound tube in Flemington, Melbourne, Australia, is designed to reduce roadway noise without detracting from the area's aesthetics. A man inserting an earplug in his ear to reduce the noise exposure. The Hierarchy of Controls concept is often used to reduce noise in the environment or the workplace. Engineering noise controls can be ...

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