Patents Assigned to R. A. McDonald
  • Dynamic threshold binary generator
    Patent number: 4644410
    Abstract: A dynamic threshold binary generator to generate a binary video image having a standard video signal fed to three positive peak detectors and three negative peak detectors, each group of three connected through respective OR gates to a sample and hold circuit then fed to an averaging circuit which then feeds to a comparator which also receives the standard video signal delayed, to then feed out the binary video image signal.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: February 17, 1987
    Assignee: R. A. McDonald
    Inventor: Roger J. Schlichtig