Cell Phone Development History & Applications

1G or first-generation wireless telephone technology (cellphones) were introduced in the the 1980s.  These were analog cellphone standards, as apposed to 2G or digital cellphone standards.  The term analog can best be understood when viewed in electrical terms.  In this vain, a sine wave is transmitted from once source to another through an electrical circuit.  The change in frequency and voltage in the electrical circuit is transmited from one end of a circuit and is received at the other end.  This is basically how the old "rotary" or "analog" phones worked. Look at it this way — a person picks up a telephone and speaks into the mouthpiece.  The fluctuations in sound ( causing a change in air pressure) strike the diaphram of the microphone which causes fluctuations in a voltage or current in the electrical circuit.  The circuit travels down the telephone line to the receiver where the changes in voltage cause fluctuations in the speaker and the sound is recreated.

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