ANC headphones history background sounds with microphones and invert its section working with designed-in electronics. Then they Enjoy the inverted/reverse sound again into your ears, which cancels out the background noises. Physicist Werner Meyer-Eppler had been encouraged by Homer Dudley's 1948 creation with the Vocoder and began in 1951 to https://www.youtube.com/watch?v=l5x6KInWXPk