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. 14, 1985
Filed:
Oct. 13, 1981
Katsumi Tobita, Soma, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
In a pay television channel selector, a reception contract selecting portion comprises parallel circuits which are disposed in correspondence with channels and whose impedances are made different between the contracted and uncontracted channels, and a control circuit device whose output level changes depending upon the impedances of the parallel circuits, so that the scrambled broadcast of the contracted channel is descrambled on the basis of the output control signal of the control circuit device. The tapping of the uncontracted channel ascribable to the imperfection of a double lock preventive mechanism of multi-throw switches used as channel selecting switches can be prevented.