Noise canceling is a hallmark feature of top headphones across brands, from Apple AirPods Pro and Beats earbuds to Sony and Bose headphones. Behind these popular noise canceling headphones, though, is cutting-edge hardware running sophisticated algorithms. What kind of audio processing is necessary to eliminate background noise when listening to music or watching a movie?

WSJ dives into how noise canceling works, how the technology has changed and where things are headed.

0:00 A sound wave and its inverse
0:32 Destructive interference
1:30 Noise-canceling headphones’ origins
3:17 What background noise to remove
4:46 Transparency modes or aware modes

Tech Behind
'The Tech Behind' explores the amazing engineering, computing, science and algorithms that power our favorite tech.

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