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The predigital period lasted 28 years from 1937 to 1965. In 1937 Alec Reeves invented the pulse modulations: PAM, PPM and especially PCM. In 1965, Gordon Moore published his famous law, planning a fast development of the Integrated Circuits (ICs). During this predigital period many theoretical and experimental works were carried on. The 1940psilas were the years of intense works on the Communications...
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