Microphone - Wikipedia
https://en.wikipedia.org/wiki/Microphone
WEBShure Brothers microphone, model 55S, multi-impedance "Small Unidyne" dynamic from 1951. A microphone, colloquially called a mic (/ m aɪ k /), or mike, is a transducer that converts sound into an electrical signal.Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, …
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