The experiment of Heinrich Hertz Optical telegraphic station, about 1800 The field of telecommunications covers all the techniques and methods of exchanging and distributing messages over any required distance. A transmitter at one end encodes units of information, converts them to electrical or optical signals, and transmits them to a receiver at the other end which converts the signals back to their original form. When we make a local telephone call which relies on an entirely analog process, the conversion of the sound waves produced by the voice is effected with the aid of a microphone, their transmission is along copper wires, and their reconversion takes place in the loudspeaker of the earpiece.
Human speech acts as a code.
An exchange ensures that communication is established with the desired partner. An illuminated panel illustrates the journey and the processes a message undergoes from the sender to recipient. These include the conversion and encoding of the signals, their transmission by cable or radio, switching, and decoding and reconversion. The exhibition is designed around these subjects, each of which is explored chronologically. Videos and interactive information systems offer more detailed explanations.