Who first recorded human voice?
Édouard-Léon Scott de Martinville, a French printer and bookseller who lived in Paris, invented the earliest known sound recording device, the phonautograph. It was patented in France on 25 March 1857.
The phonautograph used a horn to collect sound, attached to a diaphragm which vibrated a stiff bristle which inscribed an image on a lamp black coated, hand-cranked cylinder. Scott built several devices with the help of acoustic instrument maker Rudolph Koenig. Unlike Edison's later invention of 1877, the phonograph, the phonautograph only created visual images of the sound and did not have the ability to play back its recordings. Scott de Martinville's device was used only for scientific investigations of sound waves.
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