Patents by Inventor Mitchell M. Wilkinson

Mitchell M. Wilkinson 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).

  • Dynamic frequency and time voice encryption system and method
    Patent number: 4278840
    Abstract: A voice scrambler system (10) for encryption of a voice signal is provided. The voice scrambler system (10) includes a first generator (124) for generating a fixed frequency signal. A second generator (132) is provided for generating a plurality of frequency signals. Control circuitry (134) is provided for dynamically controlling the second generator (132) for randomly generating the plurality of variable frequency signals. A mixer (122) heterodynes the voice signal with the fixed frequency signal generated by the first generator (124). A filter (126) filters the output of the first mixer (122). An adder (128) adds the voice signal and the output of the first filter (126). A second mixer (130) heterodynes the output of the adder (128) with one of the plurality of frequency signals generated by the second generator (132). A second filter (136) filters the output of the second mixer (130) to generate an encrypted voice signal.
    Type: Grant
    Filed: March 23, 1979
    Date of Patent: July 14, 1981
    Assignee: Datotek, Inc.
    Inventors: Barrie O. Morgan, Mitchell M. Wilkinson