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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. 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 ...

4. Noise reduction - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction

   Noise reduction. Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode ...

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

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

   Tisch recommends this white noise machine, which features 14 different sound options to lull you to sleep. "White noise, calming ocean waves, the soothing fall of rain, and more," she notes of ...

6. Best Noise-Cancelling Headphones: Here’s Where To Get Bose ...

   www.aol.com/lifestyle/best-noise-cancelling...

   Best Sound Bowers & Wilkins Px7 S2 Headphones. Bowers & Wilkins Px7 S2 in black. If sound quality is most important to you, ... They also have top-of-the-line noise-cancelling features, so you can ...

7. 5 Great Sound Machines That Will Transform Your Sleep - AOL

   www.aol.com/lifestyle/5-great-sound-machines...

   In fact, this sound machine offers only the essentials, including a volume knob, a timer, and just six built-in sounds (White Noise, Thunder, Ocean, Rain, Summer Night, and Brook).