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1835 -THE TELEGRAPH
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. -
1853 - Multiplexing
it is a devices that can transform the signel from analog to digital or upside dwon = amplifier ( dac/amp ) -
Period: to
THE FIXED TELEPHONE
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. -
1973 - MOBILE PHONE
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.
