pytness t1_j2f6ckg wrote
Reply to comment by Left__blank in Eli5 How exactly does Noise cancellation work? That too in such small airbuds by Professional-Ad3441
There is no need to analyze it.
Sound is a wave like this: ---^v---
Notice it goes normal, up, down, normal.
If the microphone gets up, it produces a down and the other way around like this: ---v^---
So if you sum the waves (what u hear) you get --------
Left__blank t1_j2f7tj6 wrote
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
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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