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Noise-canceling robots to 'mute' loud conversations in cafe | What if we told you that we can actually silence a noisy table right next to us in a café? (interestingengineering.com)

submitted 1 year ago by L4s to c/technology

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Noise-canceling robots to 'mute' loud conversations in cafe | What if we told you that we can actually silence a noisy table right next to us in a café?::undefined

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[–] [email protected] 22 points 1 year ago (9 children)

Wait, what? Doesn’t phase cancellation actually cancel the waves? How can it be inaudible but still present?

[–] vector_zero 24 points 1 year ago (5 children)

The waves are canceled (i.e. gone) until something goes wrong. You could end up accidentally causing constructive interference, in which case you my double the sound's amplitude.

[–] [email protected] 4 points 1 year ago (1 children)

Thankfully double would only be 3db, and 10db is about a doubling by our perception?

[–] br3d 14 points 1 year ago

Yes - but 3db is twice the energy, which is what matters when it comes to damaging your cochlea

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