Over two hundred years ago, in 1779, Christian Kartzenstein did 5 whistles that made blew the vowels artificially. Few years after, in 1791, Wolfgang von Kemplelen presented his "Acoustic-Mechanical Speech Machine" that we could consider the first voice synthesizer because it could produce isolated sounds and some sound combinations.
Kempleen began his work before Kratzenstein, in 1769 and, after 20 years of investigantion, published a book where he explain his studies about the human voice production and the made experiments with his machine, which probably it sounded like a kind of speaking trumpet. The esential pieces of the machine were: a bellows that simulated the lungs, a whistle that acted as the vocal cords, and a tube of leather to simulated the vocal tract.
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