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Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...
Architectural acoustics noise control practices include interior sound reverberation reduction, inter-room noise transfer mitigation, and exterior building skin augmentation. In the case of construction of new (or remodeled) apartments , condominiums , hospitals , and hotels , many states and cities have stringent building codes with ...
Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [ 3][ 4] Changes in the immune system and birth defects have been also attributed to noise exposure. [ 5] Although age-related health effects ( presbycusis) occur naturally with age, [ 6] in ...
Valley Dale Ballroom. / 40.002408; -82.937170. The Valley Dale Ballroom is a historic building in Columbus, Ohio. Constructed in 1925, it became a nationally known ballroom during the Big Band era of the 1930s and 1940s. It was listed on the National Register of Historic Places in 1982 and the Columbus Register of Historic Properties in 1985.
The Book Loft of German Village is an independent bookstore in the German Village neighborhood of Columbus, Ohio. Opened in 1977 and described by the Columbus Business First as "iconic" and a "tourist destination", [ 1] the store has also been called "a national treasure" by The New York Times. [ 2] The Book Loft has been described by visitors ...
The LeVeque Tower is a 47-story skyscraper in Downtown Columbus, Ohio. At 555 feet 5 inches (169.29 m) it was the tallest building in the city from its completion in 1927 to 1974, and remains the second-tallest today. Designed by C. Howard Crane, the 353,768-square-foot (32,866.1 m 2) Art Deco skyscraper was opened as the American Insurance ...
Soundproofing is any means of impeding sound propagation.There are several basic ways to reduce sound: increasing the distance between 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 active antinoise sound generators.
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 sounds, but rather reflects sound energy. This is more conceptual than physically achievable: even ...
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