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:
Nov. 28, 1995
Filed:
May. 07, 1993
Applicant:
Inventors:
Tooru Sasaki, Tokyo, JP;
Kaoru Gyotoku, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381 92 ; 381 94 ;
Abstract
A microphone apparatus having a first microphone for picking up a desired sound and a second microphone with directionality in which sensitivity is low to the desired sound arrival direction. A sound signal from the second microphone is supplied to a subtracting circuit through an adaptive filter. The subtracting circuit subtracts an output signal of the adaptive filter from the sound signal coming from the first microphone. A circuit is provided to adjust the adaptive filter so that the output power of the subtracting circuit is minimized. The setup implements a microphone system which is compact in size and easily provides desired directionality.