Patents by Inventor Fredreck H. Auld

Fredreck H. Auld has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Data encryption technique for subscription television system
    Patent number: 4514761
    Abstract: A subscription television system includes a head-end for transmitting selected fields of a television signal in a scrambled form, the scrambled fields being identified by an encrypted mode control code inserted in a selected horizontal line of the preceding vertical interval. The mode control code is formed such that a predetermined non-transmitted control code is realized when the mode control code is processed with vertical interval system control data according to a selected function. A decoder processes the received mode control code and system control data according to the selected function to reconstitute the predetermined control code for enabling unscrambling of the following field. The decoder may employ majority voting techniques whereby not all of the bits of the reconstituted control code need be properly recovered to enable the unscrambling function.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: April 30, 1985
    Assignee: Zenith Electronics Corporation
    Inventors: Richard G. Merrell, Fredreck H. Auld