savvytechno

A microphone, sometimes referred to as a mike or mic (both IPA pronunciation: [ma?k]), is an acoustic to electric transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones, tape recorders, hearing aids, motion picture production, live and recorded audio engineering, in radio and television broadcasting and in computers for recording voice, VoIP and numerous other computer applications.

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Do you know how it converts the signal?

vipl

Microphone is a device that converts sound waves into analogous electrical waves. It contains a flexible diaphragm composed of film or foil that vibrates as it makes contact with the sound. The diaphragm movement modulates an electrical current by various methods. In a carbon mike, used in telephones for more than a hundred years, the diaphragm changes the pressure in carbon grains, changing its resistance.

In a condenser mike (electrostatic mike), the diaphragm changes the capacitance between itself and a metal plate, both acting as electrodes. The widely used electret mike has a charged dielectric between the electrodes that generates voltage.

Crystal microphones use a piezoelectric diaphragm that produces voltage when subjected to the sound waves (mechanical pressure). Dynamic mikes use a diaphragm attached to a movable coil that generates voltage as it moves between the poles of a magnet.