Eli5 How exactly does Noise cancellation work? That too in such small airbuds

Question

Eli5 How exactly does Noise cancellation work? That too in such small airbuds

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Answer 1

The speaker sends out a tone at a very high frequency. That frequency is particular that it actually interrupts noise outside.
Think of if you run your ear aggressively as if you’re itchy, you might get a high eering tone afterwards. You may also have noticed you don’t hear anything for a few seconds. That’s the whole concept of noise cancellation.

Hope this helps.