Microphone: History and Key Facts
A microphone, colloquially called a mic (), or mike, is a transducer that converts sound into an electrical signal.
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A microphone, colloquially called a mic (), or mike, is a transducer that converts sound into an electrical signal.

Microphone Showdown 3 by Various: the LibriVox audiobook summary, 57 original MP3 tracks, 1:27:28 running time and a link to listen.