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A microphone is a transducer designed to convert physical sound waves into electrical ones.
The device consists of a diaphragm which responds to the sound pressure waves. This in turn will operate some method of producing electrical signals from that movement. This could be variations in capacitance, or magnetism or so on.
Early telephone microphones merely had a container of electrically-conductive granules, (carbon microphone) and were somewhat noisy as a result. They had a high signal output however which was vry important at the time. The arrival of the vacuum tube allowed amplification, though the carbon mike still had application in simple phone systems.
The early wax-cylinder microphones used the sound energy directly to cut a groove in the wax cylinder.
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