Patents Assigned to W. C. Lindsey Inc.
  • Correlative tracking system with lock indicator
    Patent number: 4100503
    Abstract: Apparatus for indicating whether a correlation tracking system such as a phase-locked-loop has locked onto a periodic signal or not, utilizing a quadri-correlation circuit and digitalizers for the in-phase and the quadrature correlation signals, and logic circuitry for detecting the direction of transitions in the output state combinations of the digitalizers, and for adding the detector output signal rates for obtaining lock.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: July 11, 1978
    Assignee: W. C. Lindsey Inc.
    Inventors: William C. Lindsey, Heinrich Meyr, Peter C. King