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. 18, 1986
Filed:
May. 02, 1983
Applicant:
Inventor:
Marc Chomet, Huntington, NY (US);
Assignee:
Teleglobe Pay-TV System, Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04K / ; H04N / ; H03H / ;
U.S. Cl.
CPC ...
358118 ; 333175 ; 333176 ; 333177 ; 455 30 ;
Abstract
Selected interference frequency signals are inserted into the video or RF signal at the transmitter for scrambling purposes, either singly or in pairs. At the receiving end the signals are decoded by use of filters matched to the transmitted signal. The system allows different scrambling for each pay program thereby increasing the security relative to the prior art single frequency system.