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:
Mar. 25, 1986
Filed:
Dec. 12, 1983
Tsutomu Kanai, Saitama, JP;
Clarion Co., Ltd., Tokyo, JP;
Abstract
A wireless subscription television system arranged to transmit ciphered video signals from a transmitter to receivers in which the transmitting system comprises an enable code setting means, a transmitting means for transmitting control signals to allow a respective enable code of a receiving system to be picked up and a converting means for masking said enable codes and sending out masked enable codes, and on the other hand, the receiving system has a plurality of decoder systems each comprising a key code input means, a means for picking up a key code put in by the input means after converting it into an enable code by means of the control signals and a comparator means for determining if the picked-up enable code and the enable code as masked sent from the transmitting system are same or not. Thus, when the both enable codes come to be same, the respective decoder system is set in receivable condition.