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:
Jun. 11, 1996
Filed:
Aug. 03, 1994
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381 26 ; 381 91 ;
Abstract
In a small-sized pressure gradient type microphone apparatus, a plurality of omni-directional microphone units are encased within a microphone holder. A plurality of acoustic passages having first and second ends are provided within the microphone holder for coupling the sound inlets of the plurality of omni-directional microphone units respectively to an outer space of the microphone holder. The second ends of the acoustic passages opened to the outer space of the microphone holder are arranged to be apart from each other at distances larger than distances between the sound inlets of the corresponding microphone units coupled at the first ends of the acoustic passages.