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Related to Carbon Microphone: movie camera, mimeograph
carbon microphone[¦kär·bən ′mī·krə‚fōn]
a microphone in which carbon granules are used to convert sound vibrations into electrical variations. Carbon microphones are distinguished from other microphone systems by their extremely high sensitivity and their simplicity of design; their quality characteristics, however, are poor. The microphones are used primarily in telephony.