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:
May. 01, 1984
Filed:
Nov. 12, 1981
Applicant:
Inventor:
Nobuo Terui, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 65 ; 360 67 ;
Abstract
Disclosed is a variable frequency-response equalizer which includes an amplifying circuit having a predetermined equalizing frequency characteristic, a time constant changing circuit for changing a time constant regarding the high frequency response of a playback output signal produced from the amplifying circuit, and a level sensor for determining a change of the time constant caused by the time constant changing circuit according to the level of the signal amplified by the amplifying circuit. The magnitude of the time constant is reduced when the level of the signal amplified becomes lower than a predetermined value.