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:
Sep. 05, 1989
Filed:
Sep. 08, 1988
Gerald O Crowther, Sutton, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a transmission system authorization codes are transmitted to authorize subscribers to receive scrambled signals in an intelligible manner, such a system being a television transmission system. If each subscriber were assigned a unique authorization code an extremely long period of time would be required to transmit these codes for a national broadcast system. With the present arrangement, the authorizing code includes a multi-bit binary code word (18,20) which is unique to a group of subscribers, this code word being followed by a train of binary pulses (19',19';21', 21',) the number of pulses in the train being not less than the number of subscribers in the group. Each subscriber is allocated a unique pulse position in the pulse train (19',19';21',21',) at which position the state of the pulse either authorizes or inhibits the subscriber from receiving the scrambled signal intelligibly.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile