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:
Feb. 27, 1990
Filed:
Jul. 12, 1989
Applicant:
Inventor:
Akira Yaoita, Tokyo, JP;
Assignee:
Viva Co., Ltd., Noda, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381 83 ; 381 93 ;
Abstract
A howling protective apparatus comprising a phase fluctuation control means, a wave peak comparison means and a timer circuit, wherein said phase fluctuation circuit is controlled by an output from said timer circuit; a howling protective apparatus comprising a gain control means, a wave peak comparison means and a changing means for varying a coefficient of integration; a howling protective apparatus comprising a phase fluctuation circuit, a variable gain circuit and a wave peak comparison circuit, wherein said phase fluctuation circuit and the variable gain circuit are controlled by an output from said wave peak comparison circuit.