How Do Noise-Canceling Headphones Work?
You're on a flight, and the drone of the engines is getting on your nerves, so you pop on a pair of noise-canceling headphones, and sweet, blessed silence descends. But those headphones aren't...
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You’re on a tedious flight, and the drone of the engines is getting on your nerves. So you pop on a pair of noise-canceling headphones, and sweet, blessed silence descends. But those headphones aren’t just muffling the sound -- they’re actually making it go away. Active noise-canceling headphones get rid of noise using the physics of sound waves, and their ability to cancel eachother out using what’s known as destructive interference. Sound is made up of waves. And as a sound wave moves through the air, it compresses and expands the air in repeating patterns. Destructive interference is what happens when a second sound wave combines with the first -- but this second wave has a pattern that expands the air where the first wave was compressing it,...
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You’re on a tedious flight, and the drone of the engines is getting on your nerves. So you pop on a pair of noise-canceling headphones, and sweet, blessed silence descends. But those headphones aren’t just muffling the sound -- they’re actually making it go away. Active noise-canceling headphones get rid of noise using the physics of sound waves, and their ability to cancel eachother out using what’s known as destructive interference. Sound is made up of waves. And as a sound wave moves through the air, it compresses and expands the air in repeating patterns. Destructive interference is what happens when a second sound wave combines with the first -- but this second wave has a pattern that expands the air where the first wave was compressing it,...
