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carbon microphone
electroacoustic device
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- principles of operation
- In microphone
… of a carbon contact (carbon microphone), in electrostatic capacitance (condenser microphone), in the motion of a coil (dynamic microphone) or conductor (ribbon microphone) in a magnetic field, or in the twisting or bending of a piezoelectric crystal (crystal microphone). In each case, motion of the diaphragm produces a variation…
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work of
- Edison
- In Thomas Edison: Menlo Park
…used in telephone speakers and microphones for a century thereafter.
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- Hughes
- In David Hughes
…an Anglo-American inventor of the carbon microphone, which was important to the development of telephony.
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