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Video signal scrambling and descrambling systems

  • US 4,563,702 A
  • Filed: 05/27/1983
  • Issued: 01/07/1986
  • Est. Priority Date: 05/27/1983
  • Status: Expired due to Term
First Claim
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1. A system for scrambling video information lines, comprisinga memory;

  • storage means for sequentially storing groups of a plural predetermined number of said video information lines in the memory; and

    retrieval means for forming groups of a corresponding number of 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 said information was stored;

    characterized by the retrieval means comprising mens for 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 occupyiny 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.

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