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Commonly known as "microphone" or "microphone", microphone is a transducer that converts sound into electrical signals.

Microphones are used in many applications, such as telephones, hearing aids, public address systems for concert halls and public events, film production, live and recorded audio engineering, recording, two-way broadcasting, loudspeakers, broadcasting and television broadcasting, as well as computers for recording speech, speech recognition, VoIP and non acoustic purposes, such as ultrasonic sensors or knock sensors.

Several different types of microphones are used, which use different methods to convert the pressure changes of sound waves into electrical signals. The most common is a moving coil microphone, which uses coils suspended in a magnetic field. The capacitor microphone uses the vibrating diaphragm as the capacitor plate, and the piezoelectric microphone uses the piezoelectric material crystal. A microphone usually needs to be connected to a preamplifier before it can record or reproduce a signal.

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