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2. 8 white noise machines for better sleep - AOL

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

   This simple white noise machine offers ten fan sounds and ten ambient noise variations (including white, pink and brown noise). It is powered by either AC or USB and you can adjust the volume with ...

3. The 6 Best Sound Machines for a Restful Night's Sleep - AOL

   www.aol.com/6-best-sound-machines-restful...

   In addition to an adjustable strap, this sound machine from the experts at Yogasleep contains 20 noise options, and a sleep timer for either a 45-, 90 minute, or eight-hour snooze.

4. Soundcore Sleep A10 review: Super-small earbuds to help ... - AOL

   www.aol.com/lifestyle/soundcore-sleep-a10-review...

   Soundcore Sleep A10: The sound and the fury. These aren't just for nighttime use; the A10 earbuds can play music, podcasts and the like from any app on your phone. While that adds value to the ...

5. 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 ...

6. 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 ...

7. 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 ...