The exposition presents all main communications technologies that facilitate transmittal of information.
Natural means of information transmittal (voice-hearing, gestures-sight) soon ceased to satisfy the needs of mutual communication in human society, and it was necessary to utilize suitable phenomena of nature or acoustical signals. Along with the development of human knowledge about the world around us, science and technology developed as well.
One of the first historical milestones in communications was the year 1792, when the Frenchmen Claude Chappe presented a design for setting up an optical telegraph. In 1862 Philipp Reis was the first to transmit human speech electronically over a long distance. In 1876 the Americans Alexander Graham Bell and at the same time Elisha Gray announced independently of each other the discovery of a two-way electro-acoustical converter - the principal of the telephone receiver that is used to the present day. The first instruments for transmission of Morse code using spark telegraphy were assembled by the Italian G. Marcone around 1896. Over the following years the range of wireless stations quickly expanded. For the first time it was possible to establish contact with ships at sea. In case of problems it was thus possible to call for help, as in the case of the sinking of the Titanic.
The first radio station was KDKA in Pittsburgh in the USA, which commenced broadcasting in 1920. In Czechoslovakia, radio broadcasting was commenced already in May 1923.
Work on television was underway in the world already in the 1920s. At first mechanical principles were used, but by the 1930spurely electronicprinciples prevailed.In Czechoslovakia at the time only small groups of enthusiasts worked on television; serious and intensive work on the development of television in our country did not begin until after 1945. Regular television broadcasting was commenced here on 1 May 1953.
The phenomenon of the end of the twentieth century has become the Internet - presently the most extensive and best-known computer network, which has earned the designation "the network of networks". The origin of WWW service on the Internet in 1990 was the first step toward a global information network. The Internet, using transmission services of all existing telecommunications networks, envelops the whole globe literally like a spider web. This is expressed in the well-known letters WWW (World Wide Web), the famous "web pages", which besides electronic mail are the best known service on the Internet.
Communications satellites are used today for transmission of information over great distances and to almost any desired place on the globe. Satellites are linked to systems of terrestrial stations that mediate the connection of satellite systems with terrestrial networks. These complexes of information networks, mediating today'sglobal interconnection of all countries and continents, have given rise to the designation of the world as a "global village".
The chief partners of the exposition are EuroTel Praha and SPT Telecom, additional partners of the exposition are Siemens and Philips ╚R.
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