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:
Jan. 07, 1986
Filed:
May. 27, 1983
Jerrold A Heller, San Diego, CA (US);
Woo H Paik, San Diego, CA (US);
M/A-COM Linkabit, Inc., San Diego, CA (US);
Abstract
Systems for scrambling and descrambling video information lines. The scrambling system includes a memory; a storage system for sequentially storing groups of four video information lines in the memory; and a retrieval means for forming groups of four scrambled video information lines by retrieving the stored video information from the memory in a sequence different from the sequence within the stored group in which the information was stored. The retrieval system forms the scrambled video information lines by retrieving a portion of a first stored video information line from a first position therein to form a portion of a first scrambled video information line occupying a second position therein; retrieving a portion of the first stored video information line from the corresponding second position therein to form a portion of a second scrambled video information line occupying a position therein other than the corresponding second position; and forming the portion of the first scrambled video information line occupying the corresponding first position therein by retrieving a portion of a stored video information line other than the first stored video information line from a position therein other than the corresponding first position. The sequence of formation of the scrambled lines, the respective sizes of the retrieved portions, and the combinations of stored video lines within the stored groups for forming the first and second scrambled video lines are varied from one group to the next in response to a keystream of control bits. The descrambling system functions conversely to the scrambling system.