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2. Best noise-canceling headphones, according to Consumer ... - AOL

   www.aol.com/best-noise-canceling-headphones...

   Consumer Reports doesn’t test battery life in headphones, but Sennheiser says this model will run for up to 20 hours with Bluetooth and noise canceling turned on. It can be used over Bluetooth ...

3. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

   www.aol.com/noise-canceling-headphones-harmful...

   Learn the pros and cons of noise-canceling earbuds (or headphones), and how to prevent hearing damage when using them.

4. Block Out the Babble with the Best Noise-Canceling Headphones ...

   www.aol.com/finance/block-babble-best-noise...

   Whether it's over-ear "cans" that completely block out all sound, or smaller and lighter earbuds that let you move, exercise, and even run, noise-canceling headphones will deliver the...

5. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   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 .

6. 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.

7. Adaptive noise cancelling - Wikipedia

   en.wikipedia.org/wiki/Adaptive_noise_cancelling

   Some noise cancelling headphones utilise adaptive noise cancelling techniques. The effects of ambient ambient noise which penetrates inside the earphone can be minimised by using the version of the ambient noise from a small microphone situated on the outside of the headset as the reference signal.