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Let's take the AirPods Pro as an example: The external microphones on the headphones pick up sound in the environment and then create an inverse wave to offset the noise around the wearer.
Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.
Of course, the best noise-canceling headphones are more than souped-up electronic earplugs. ... You can pick up this model for just $60, and our tests show it beats models that cost hundreds more.
Active noise-cancelling headphones use a microphone, amplifier, and speaker to pick up, amplify, and play ambient noise in phase-reversed form; this to some extent cancels out unwanted noise from the environment without affecting the desired sound source, which is not picked up and reversed by the microphone. They require a power source ...
The distance from the earpiece to your ear drum is possibly 3 to 4 cm. If you're 8 cm away, you hear about the same background noise plus less than 1/4 of out of sync and distorted counter-noise. If you're a few steps away, you hear the background noise and nothing else. (I don't have a noise-cancelling earphone. I can't experiment.)
The Select 300 offers sound quality comparable to a prescription device, thanks to technology that includes a dual-core chip that enables it to differentiate between speech and background noise ...
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