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He died in 1879, never knowing that his "visual text" would one day be heard by the world as the earliest recognizable recording of a human voice. The Unexpected Stories You Never Learned in School

The video you referenced, The Unexpected Stories You Never Learned in School , features the fascinating story of , a French printer who invented the first sound recording device, the phonautograph, in 1857. The Man Who Recorded Sound Before Edison 0gsw399jaqwagfppmdgui_source-UIHJpu5z.mp4

: He never intended to "play back" the sound. Instead, he believed people could learn to "read" the visual squiggles of sound waves just like text. He died in 1879, never knowing that his

: For 150 years, these recordings remained silent "visuals." In 2008, scientists used microscopic digital imaging to scan the soot-etched paper and play it back as audio. Instead, he believed people could learn to "read"

: Inspired by the anatomy of the human ear, Scott de Martinville built a device that used a speaking cone and a vibrating pin to etch sound waves onto paper covered in soot.

: The recording revealed a haunting performance of the French folk song "Au Clair de la Lune." Initially, researchers thought it was a woman or child, but later realized it was Scott de Martinville's own voice played at the correct speed.