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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   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 ...

3. 8 white noise machines for better sleep - AOL

   www.aol.com/news/8-white-noise-machines-better...

   Hatch Restore 2. The Hatch Restore 2 is a cross between a sunrise alarm clock and a sound machine that enables you to play consistent white noise. Sunrise alarm clocks gradually emit light to ...

4. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...

5. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   White noise machine. A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds. Often such devices do not produce actual white noise, which has a harsh sound, but pink noise, whose ...

6. Apple AirPods 4 review: Still the top choice for a reason

   www.aol.com/finance/apple-airpods-4-review-still...

   Apple’s AirPods 4 with ANC use internal and external microphones and speakers to drown out environmental noise. I wore the AirPods 4 with ANC on a cross-country flight from Apple’s Sept. 9 ...

7. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...