If, as you pressed on the string on one side, someone else were to press on the string from the opposite side at the exact same place with the exact same force, the string would barely move. If someone were to press down on the string in the direct center, that would disturb the string, causing a ripple. Picture the air molecules as a string stretched between two points. However, if a sound wave meets another sound wave that is the exact same in frequency and opposite in amplitude, the two largely negate each other. These waves travel through the air and into your ear canal, where they vibrate your eardrum. As you probably know, sound travels in waves, moving the air molecules. The physics of active noise cancellationĪctive noise reduction technology functions primarily by exploiting a principle of physics called phase cancellation. (Spoiler: It’s the airplane engine.) The reason has to do with the physics of sound and how noise-cancelling headphones work. The trouble is, active noise cancellation is really effective on only one of those things. People purchase them in the hopes of dimming the din of kids at play, loud-talking officemates, the barking dog next door, and airplane engines. It’s a popular misconception that noise-cancelling headphones can block out any sound around you. This scene drives me bonkers because, as a headphones expert, I know the truth: That’s not how noise-cancelling headphones work. ![]() Meanwhile, a father relaxes blissfully undisturbed because he’s wearing noise-cancelling headphones. In it, a young boy jumps on a bed, raucously playing an electric guitar while another kid plays drums. This Amazon commercial bugs the heck out of me.
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