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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 ...
The "QuietComfort 20" (QC20) and QC20i in-ear headphones were released in 2015 and are the company's first in-ear noise cancelling headphones. [19] It received a 2014 Red Dot Design Award. [20] Also, it received a CNET 's Editors' Choice Award of 4.5/5 points for its active noise-cancelling. [21]
Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...
Aviation Headset Series I. The "Aviation Headset Series I" was sold from 1974 to 1989. Tests found that pilots achieved intelligibility scores of 55% at 115 dB with the Series II headset, compared to 80% for headsets without a noise cancelling function. Aviation Headset X. The "Aviation Headset X" was sold from 1998 until 2010.
Pages in category "Aircraft noise reduction". The following 6 pages are in this category, out of 6 total.
Aircraft noise reduction (6 P) Pages in category "Aircraft noise" The following 7 pages are in this category, out of 7 total.
Aircraft maintenance program AMT Aircraft Maintenance Technician: ANC Active noise cancellation AND Aircraft Nose Down ANN Annunciator panel: Caution warning system normally containing visual and audio alerts to the pilot ANPT Aeronautical national pipe taper ANR Active noise reduction ANSP 1: Air navigation service provider: ANSP 2
All noise cancelling headphones don't require the noise cancelling function to operate; see the Sennheiser PXC lineup for comparison. Additionally, I checked a PXC250 out myself - it doesn't go around the ear, but it -is- a closed supra-aural headphone, offering both passive and active noise cancellation as a result.