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. 20, 1990
Filed:
Sep. 13, 1988
Applicant:
Inventors:
Kazuhisa Ishiguro, Gunma, JP;
Mikio Yamagishi, Gunma, JP;
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04H / ;
U.S. Cl.
CPC ...
381 10 ; 381-1 ;
Abstract
Levels of a stereo sum signal and a stereo difference signal are detected by first and second level detectors (7, 9), respectively. Outputs of the first and second level detectors (7, 9) are compared with each other by a comparator (10). A voltage controlled amplifier (4) is responsive to an output of the comparator (10) for changing a level of the stereo difference signal, when a broadcasting signal including only either one of a left stereo signal and a right stereo signal is received, such that the levels of the stereo sums signal and the stereo difference signal are equal to each other.