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2. 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 ...

3. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Early examples of urban rail systems designed using this technology were: Boston MBTA line expansions (1970s), San Francisco BART system expansion (1981), Houston METRORail system (1982), and the MAX Light Rail system in Portland, Oregon (1983). Noise barriers can be applied to existing or planned surface transportation projects.

4. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. A higher number indicates more effective sound insulation than a lower number.

5. Yelp - Wikipedia

   en.wikipedia.org/wiki/Yelp

   The Salesforce East building in San Francisco, Yelp's headquarters since late 2021 The 140 New Montgomery building in San Francisco, Yelp's former headquarters Having filed for an initial public offering (IPO) with the Securities Exchange Commission in November 2011, [ 44 ] [ 45 ] [ 46 ] Yelp's stock began public trading on the New York Stock ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

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.