Patents by Inventor Billy K. Swift

Billy K. Swift 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).

  • Phase locked loop out-of-lock detector
    Patent number: 4287480
    Abstract: The out-of-lock condition of a digital phase locked loop is detected during a plurality of states such that single bit discrepancies, such as a noise pulse, are ignored, and thus the tolerable range of phase detection error is broadened. The present invention is adaptable for use with typical applications of digital phase locked loops, and can be used to control the phase detector of the digital phase locked loop such that error voltages will be introduced into the loop only during selected states.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: September 1, 1981
    Assignee: Sperry Corporation
    Inventors: Billy K. Swift, Anthony F. Zizzo, Willard A. Blevins