Condenser microphone
A condenser microphone comprises a condenser microphone unit, a microphone signal output transmission line, a load resistor, a power source, and the like. The condenser microphone is structured in such a manner that it has a conductive diaphragm and a conductive fixed electrode oppositely arranged through the air layer in parallel with the conductive diaphragm, and the change of the capacitance between the conductive diaphragm and the conductor fixed electrode due to the vibration of the diaphragm is detected as the sound pressure on the diaphragm. The condenser microphone is provided with a microphone unit including diaphragms arranged opposedly at predetermined intervals and a fixed electrode, and is widely popularized irrespective of general public welfare or business because of high fidelity of sound and easy miniaturization thereof. Condenser microphones include a flexible diaphragm or membrane and a rigid backplate that may contain one or more openings. Together, the membrane and the backplate of the microphone form a capacitor, which is also known as a condenser. A condenser microphone includes a microphone unit in which a diaphragm and a backplate are arranged so as to be opposed to each other. The condenser microphones also comprise a printed circuit board (PCB) having a field-effect transistor (FET) connected to the PCB. These components are mounted within the housing. The microphone unit incorporates an impedance converter because of its very high impedance. Condenser or capacitance microphones are widely used to convert acoustic signals to proportionate electrical signals, such as is necessary in electronic voice communication applications.
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