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Telephones Info

The Telephone come from the Greek words tele = far and phone = voice. It is a telecommunications device that is used to transmit and receive sound. The Telephone is now one of the most common household appliances in the world today. Nearly all telephones operate through transmission of electric signals through a complex network which allows any phone number to communicate with another anywhere in the world. The Telephone runs two types of information; Signal and Voice, at different times all on the same two wires. The telephones signal equipment consists of a bell to alert the user of incoming calls and a keypad to enter the number for outgoing calls. At the telephone exchange they detect the electrical current and connects the line to the desired line and alerts that line. The Voice part of a telephone is in the handset and consists of a microphone and a receiver. The microphone is powered from the line and puts out a varied electrical current in response to the acoustic pressure produced by your voice. The variations in electric current are sent along the line to the other telephone where they are fed into a miniature loudspeaker. The varying electric current in the coil causes it to move back and forth, reproducing the acoustic pressure waves of the transmitter. When you ‘hang up’ the current ceases to flow in that line, signaling to the exchange to disconnect the call. As with many other inventions over the years such as radio, the light bulb and the computer there were several people who claim credit for the invention of the telephone; many did do pioneering work on voice transmission and improved on each other’s ideas. Antonio Meucci, Johann Philipp Reis, Elisha Gray, Alexander Graham Bell, and Thomas Edison, among others, have all been credited with pioneer work on the telephone.