A mike, informally nicknamed mic or electro-acoustic transducer could be an electrical device that converts sound into an associated electrical signal. Microphones are those units which are employed in several applications like telephones, hearing aids, public address systems for concert halls and public events, all the show production uses this technology, many live and recorded audio engineering appliances uses this, megaphones, radio and TV broadcasting, and in computers for recording voice, speech recognition, VoIP, and for non-acoustic functions like supersonic sensors or knock sensors.
Several varieties of mike area unit in use, that use totally different ways to convert the gas pressure variations of undulation to associate electrical signal. The foremost common area unit the dynamic mike, that uses a coil of wire suspended during a magnetic field; the capacitor microphone, that uses the vibratory diaphragm as an electrical device plate; and therefore the electricity mike that uses a crystal of electricity material. Microphones usually have to be compelled to be connected to a preamplifier before the signal is recorded or reproduced. The inner components of a mike area unit the first supply of variations in radial asymmetry. A pressure mike uses a diaphragm between a hard and fast internal volume of air and therefore the surroundings, and responds uniformly to pressure from all directions, therefore it's same to be omnidirectional. A pressure-gradient mike uses a diaphragm that's a minimum of partly open on either side. The pressure distinction between the 2 sides produces its directional characteristics. Alternative components like the external form of the mike and external devices like interference tubes can even alter a microphone's directional response
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