Phonautograph
From The Art and Popular Culture Encyclopedia
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The phonautograph was the earliest known invention of a sound recording device. It was invented by Frenchman Édouard-Léon Scott de Martinville and patented on March 25, 1857. It could transcribe sound to a visible medium, but had no means to play back the sound after it was recorded. The transcriptions, known as phonautograms, were first successfully played back using computer technology in 2008.
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