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Quadraphonic One-Point Pick-Up Microphone

Methods for picking up quadraphonic sounds have not yet been investigated thoroughly. At present, four unidirectional microphones are being used. It is obvious, however, that some kind of quadraphonic one-point pick-up microphone will become necessary in the near future as was the stereophonic one-point pick-up microphone. In this paper, a microphone with four diaphragms whose principal axes are perpendicular to each other in a plane are studied by equivalent electric circuits of the vibrating system.

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