Patents by Inventor Shirley H. Lee

Shirley H. Lee 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).

  • Digital voice privacy apparatus and method
    Patent number: 5506889
    Abstract: A cellular voice privacy arrangement includes a digital privacy unit which is part of each subscriber's fixed equipment. The digital privacy unit includes suitable analog to digital and digital to analog converters. A vocoder, digital signal processor and modem provide the privacy. The identification numbers of each terminal (phone) are exclusive-ORed to form a scramble variable. Vocoder data (voice coded information) is exclusive-ORed with the scramble variable to provided scrambled data for transmission.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: April 9, 1996
    Assignee: Motorola, Inc.
    Inventors: David T. Gustafson, Paul R. Kennedy, Shirley H. Lee, James B. Piket