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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 ...
QuietComfort 20. 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.
The following is a list of states that have acknowledged the possession of nuclear weapons or are presumed to possess them, the approximate number of warheads under their control, and the year they tested their first weapon and their force configuration. This list is informally known in global politics as the "Nuclear Club".
Discount pricing starts at $24.99 a month at Spectrum. Verizon. Discount pricing starts at $20 a month at Verizon. AT&T. Discount pricing starts at $30 a month at AT&T. See 2 more. Yet finding an ...
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity. The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency. The sound often has heavy harmonic ...
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 ...
Sony's popular 'buds offer superb sound quality, top-notch noise reduction and built-in Alexa. These Sony noise-cancelling earbuds have a 12,000-person fan club — and they're $80 off Skip to ...
As the first country to commercially launch mobile TV, South Korea is the most successful DMB market in the world. More than 62 million DMB enabled devices have been sold, of which the most popular are mobile phones. This number is expected to rise even more with an increase in coverage; services already cover over 80% of the country.
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