What is the minimum headphone delay, in ms, that will cancel this noise?

Noise-canceling headphones are an application of destructive interference. Each side of the headphones uses a microphone to pick up noise, delays it slightly, then rebroadcasts the noise next to your ear where it can interfere with the incoming sound wave of the noise. Suppose you are sitting 1.8 m from an annoying, 150 Hz buzzing sound

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genius_generous answered 2 years ago

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What is the minimum headphone delay, in ms, that will cancel this noise?

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