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:
Oct. 31, 2000
Filed:
Sep. 19, 1997
Applicant:
Inventors:
Kazuo Murayama, Kanagawa, JP;
Toshiya Murakami, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G / ; H03G / ; H03K / ;
U.S. Cl.
CPC ...
381 98 ; 381103 ; 327553 ; 334 29 ;
Abstract
A sound quality adjustment circuit including a status variable type active band-pass filter having an amplification circuit fed with an input signal and an integration circuit, and a controller for controlling the conversion conductance of the amplification circuit. The center frequency of the status variable type active band-pass filter is continuously varied by controlling the conversion conductance of the amplification circuit by the controller.