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Left__blank t1_j2f7tj6 wrote

Reply to comment by pytness in Eli5 How exactly does Noise cancellation work? That too in such small airbuds by Professional-Ad3441

But it does. You say so yourself: “if the microphone gets up”. Means it picks up the signal and a computer/components must produce an equal and opposite signal to match it and send to your ear simultaneously as that same sound carries into your ear canal. It’s fascinating

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pytness t1_j2f90wd wrote

I mean, yeah, but its just -signal

Most speakers go up to 20K hertz, which mean it vibrates up to 20000 a second, if you do the math 1 second / 20000 hertz * 340 (sound speed in meters per sec) = 1.7 mm

Which per each oscilation, sound travels less than 2 mm.

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