The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1989
Filed:
Mar. 17, 1987
Applicant:
Inventor:
Werner Fidi, Baden, AT;
Assignee:
AKG Akustische u. Kino-Gerate Gesellschaft m.b.H., Vienna, AT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381155 ; 381159 ; 381162 ; 381168 ; 381191 ; 181160 ;
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.