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. 19, 1985
Filed:
Jun. 03, 1982
Tetsuo Sato, Takasaki, JP;
Yasuo Kominami, Takasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A signal processing circuit which can be used, for example, as a playback equalizer is formed in a semiconductor integrated circuit with a main path and a side path arrayed between the input terminal and the output terminal of the integrated circuit. The signals at the ends of the main and side paths are added together to obtain the output signal for the signal processor. A filter in the main path determines its frequency characteristics. On the other hand, a variable gain control means having substantially flat frequency characteristics is inserted in the side path and its gain can be changed in response to control data to control the output signal of the signal processor.