Patents by Inventor Chang Chung Chen

Chang Chung Chen 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).

  • Tracking status detector for a digital delay lock loop
    Patent number: 3961282
    Abstract: An unlocked detector for a digital delay lock loop employs an up-down cour which periodically accumulates the algebraic sum of the quantized positive and negative adjustments made at a preselected rate by the incremental phase modulator. Whenever this sum reaches a specified threshold value corresponding to a particular phase error, an unlocked indication is given. Arrangements utilizing the same principle are disclosed for analog loops.
    Type: Grant
    Filed: April 28, 1975
    Date of Patent: June 1, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Chang Chung Chen, Jack K. Holmes, James L. Lewis