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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. 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 ...

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. How Active Noise Canceling (ANC) Headphones Work - AOL

   www.aol.com/active-noise-canceling-anc...

   A look at the science and engineering involved in active noise cancelation (ANC) + an exploration of noise canceling headphone's impact on our health.

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

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

   Soundcore Anker Life Q20 Hybrid Active Noise Cancelling Headphones, Wireless Over Ear Bluetooth Headphones, 40H Playtime, Hi-Res Audio, Deep Bass, Memory Foam Ear Cups, for Travel, Home Office ...

7. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   In active noise control, a microphone is used to pick up the sound that is then analyzed by a computer; then, sound waves with opposite polarity (180° phase at all frequencies) are output through a speaker, causing destructive interference and canceling much of the noise.