Patents by Inventor David P. Womble

David P. Womble 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).

  • Method of subcarrier multiplication which preserves AM Information in FM systems
    Patent number: 5257403
    Abstract: A multiplication circuit for use in an FM television transmitter and receiver is provided. The multiplication circuit includes a limiting circuit for limiting a subcarrier supplied thereto and a dividing circuit coupled to the limiting circuit and dividing the output of the limiting circuit by a predetermined factor. A mixer is coupled to the dividing circuit and mixes the output of the dividing circuit with the subcarrier.
    Type: Grant
    Filed: December 3, 1991
    Date of Patent: October 26, 1993
    Assignee: Scientific-Atlanta, Inc.
    Inventors: Luis A. Rovira, David P. Womble, Allen Walter, Robert Dennison
  • FM demodulator system with threshold extension
    Patent number: 4698598
    Abstract: A FM demodulator system which provides threshold extension by frequency selective phase modulation of the input FM signal in a band pass filter to reduce phase error between the input and output of the filter. The output of the filter is applied to an FM discriminator which provides a base band signal. This base band signal is applied to a frequency selective phase compensation network to derive a signal which phase modulates the band pass filter. The filter rejects uncorrelated thermal noise so as to effect threshold extension in the demodulator system.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: October 6, 1987
    Assignee: Scientific Atlanta, Inc.
    Inventors: Joseph G. Mobley, David P. Womble