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in 1835 the electric telegraph was developed by Samuel morse.
Each telegraph had a transmitter and a receiver, any media infromation represent a code, so the Telegraph uses morse code.
the first country was USA because to deliver a letter from the atlantic to the pacific coast, it would take 10 days and to answer it take aothers 10 days, also for the low cost service. -
it is a devices that can transform the signel from analog to digital or upside dwon = amplifier ( dac/amp )
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In 1860, Italy, Antonio Meucci was the true inventor of telephone, he was the first person to transmit the humen voice an distance using an electrical device, but of cause a economic problems he was not able to patent his invention. But in 1876, USA, Alexander Graham Bell obtained a patent for the telephone, thanks to Bell that the telephone was industrially produced.
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Martin cooper is the father of the mobile phone, he made the first mobile phone. his invention was inspired by a "communicator" the first mobile phone had a very basic features and it was very large, heavy and expensive, it used by a very few people.
