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microphone, colloquially called a mic or mike (/mk/),[1] is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephoneshearing aidspublic address systems for concert halls and public events, motion picture production, live and recorded audio engineeringsound recordingtwo-way radiosmegaphones, and radio and television broadcasting. They are also used in computers for recording voice, speech recognitionVoIP, and for other purposes such as ultrasonic sensors or knock sensors.