Directional microphone
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United States of America Patent
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-
Mar 28, 1989
Grant Date -
N/A
app pub date -
Mar 17, 1987
filing date -
Mar 20, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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