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How does a microphone work?

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Quick answer

A microphone works by turning the pressure waves of sound into an electrical signal. Sound vibrates a thin diaphragm inside the mic, and that motion is converted into a matching electrical current that can be recorded or amplified. Sound waves strike a thin diaphragm, making it vibrate.

Step by step

Sound waves strike a thin diaphragm, making it vibrate.
The vibrations are converted into a matching electrical signal.
Dynamic mics use a coil and magnet; condenser mics use changing capacitance.
The electrical signal mirrors the sound's loudness and pitch.
That signal can then be amplified, recorded, or transmitted.

People also ask

How does a microphone turn sound into electricity?

Sound moves a diaphragm; that motion either moves a coil near a magnet or changes a capacitor, generating a matching electrical signal.

What's the difference between dynamic and condenser mics?

Dynamic mics use a moving coil and are rugged; condenser mics use a charged plate, are more sensitive, and need power.

Is a microphone the opposite of a speaker?

Essentially yes — a mic turns sound into an electrical signal, while a speaker turns an electrical signal back into sound.

How does a microphone turn sound into a signal?

Sound vibrates a diaphragm, and that motion is converted into a matching electrical current.

What are the main types of microphones?

Common types include dynamic (magnet and coil) and condenser (charged plates) microphones.

How do voice assistants use microphones?

Mics capture your speech as a signal, which AI then converts to text and interprets.