Directional microphone

Details Directional microphone Directional microphone

1987-03-17

1989-03-28

Caldwell, Sr., John W.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

381159, 381162, 381168, 381191, 181160, H04R 908

Patent

active

048171689

ABSTRACT:
A directional microphone operating according to the electrostatic or electrodynamic transducer principle. The pickup effect of the microphone is determined by a single phase-shifting delay line section between the rear side of the active transducer diaphragm and at least one sound entry opening provided in the microphone housing at a distance behind the plane of the diaphragm. The microphone includes at least one acoustic element coupled to the delay line section. The delay line section is arranged with the acoustic element or elements so as to have a lower limit frequency in the range of 300 Hz.

REFERENCES:
patent: 2627558 (1953-02-01), Wiggins
patent: 3115207 (1963-12-01), Wiggins
patent: 4054748 (1977-10-01), Balogh
patent: 4340787 (1982-07-01), Gorike

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