Patents by Inventor Arnold Swagerty

Arnold Swagerty 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 phase-locked loop circuit
    Patent number: 4418318
    Abstract: A digital phase-locked loop consisting of a digital phase detector for detecting the phase differences between the output and the input frequency signals, a microprocessor programmed to perform both the functions of the loop filter and the phase shifter, and a binary rate multiplier to perform the function of voltage-to-frequency conversion is disclosed. A more precise frequency resolution is obtained by use of the binary rate multiplier and a further reduction in circuit complexity is achieved by removal of the phase shifter circuit in favor of the microprocessor programming.
    Type: Grant
    Filed: March 10, 1981
    Date of Patent: November 29, 1983
    Assignee: Frederick Electronics Corporation
    Inventors: Arnold Swagerty, William A. Mitchell