Patents by Inventor David R. Bream

David R. Bream 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).

  • Frequency measurement
    Patent number: 5019823
    Abstract: An apparatus for measuring the frequency of an input signal is described. The apparatus uses a quadrature sampling system to obtain values of the instantaneous phase of the signals at a succession of time intervals, the values being converted into cumulative phase values. An estimate of the frequency is obtained by determining the gradient of the straight line which would best pass through a plot of the values of cumulative phase against time.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: May 28, 1991
    Assignee: Thorn EMI PLC
    Inventors: David R. Bream, Stephen J. Roome