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Video transmission system

  • US 4,694,489 A
  • Filed: 07/10/1986
  • Issued: 09/15/1987
  • Est. Priority Date: 12/22/1983
  • Status: Expired due to Fees
First Claim
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1. In a video transmission system providing secure transmission of a video signal over a communications channel for reception by designated customers, synchronization information indicating the starting positions of video lines and customer data for designating individual customers permitted to receive the video signal,a decoder having means for detecting the synchronization information and thereupon generating horizontal sync pulses indicating the starting positions of the video lines, wherein the improvement comprises,at least a portion of the customer data for a particular customer is transmitted in a preassigned time slot in a video line including a record number preassigned to the particular customer, andthe decoder has a customer memory programmed with a customer identification number including a programmed customer record number and a programmed customer time slot identifier, and means for latching the customer data from a video line having a record number matching the programmed customer record number, the customer data being latched from the video line at a time slot indicated by the programmed customer time slot identifier.

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