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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 alongside a carry case. 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 . Noise cancellation makes it possible to listen to audio ...

4. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Industrial noise control is a subset of interior architectural control of noise, with emphasis on specific methods of sound isolation from industrial machinery and for protection of workers at their task stations. Sound masking is the active addition of noise to reduce the annoyance of certain sounds, the opposite of soundproofing .

5. How noise cancelling headphones work - AOL

   www.aol.com/news/noise-cancelling-headphones...

   Sony WH-1000XM5 $ at Best Buy. Bose QuietComfort Earbuds Series II. Active noise cancellation in earbuds can’t quite compare with in-ear models, but that won’t stop Bose from trying — and ...

6. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [ 3][ 4] Changes in the immune system and birth defects have been also attributed to noise exposure. [ 5] Although age-related health effects ( presbycusis) occur naturally with age, [ 6] in ...

7. Even 'picky audiophiles' are fans of these $50 JBL earbuds ...

   www.aol.com/lifestyle/sound-good-airpods-noise...

   If you enable noise-cancelling, it reduces the battery life a little bit, but less than you might expect: You'll still get 8 hours per earbud and 24 on the case. The Active Noise Cancelling is ...