A microphone, sometimes called a "mic", is a device that converts sound into an electrical signal. Microphones are used in many applications such as telephones, tape recorders, hearing aids and in radio and television broadcasting.
The invention of a practical microphone was crucial to the early development of the telephone system. Emile Berliner invented the first microphone on March 4, 1877, but the first useful microphone was invented by Alexander Graham Bell. Many early developments in microphone design took place in Bell Laboratories.
In all microphones, sound waves are translated into mechanical vibrations in a thin, flexible diaphragm. These vibrations are then converted by various methods into an electrical signal.
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