Patents by Inventor Russell A. Stillman

Russell A. Stillman 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 for demodulating PSK modulated signals
    Patent number: 6696900
    Abstract: The present invention is a method for demodulating a PSK modulated signal wherein the PSK system incorporates a transmitter generating a PSK modulated signal and wherein the transmitter is crystal based. A crystal based receiver receives the PSK modulated signal and the delta phase between the recovered PSK signal and a receiver generated reference signal is measured; the measurement is repeated with a predetermined phase shift. Voltage values are derived representing the results of each of the measurements and are applied to an analog-to-digital converter to derive digital values representing the two phases measured, and a corresponding delta phase. The digital values are applied to a look up table to derive a phase correction for the reference signal, and several methods are described to perform various types of PSK demodulation.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: February 24, 2004
    Assignee: Finepoint Innovations, Inc.
    Inventors: Russell A. Stillman, Charles A. Waterbury
  • Method for demodulating PSK modulated signals
    Publication number: 20030058036
    Abstract: The present invention is a method for demodulating a PSK modulated signal wherein the PSK system incorporates a transmitter generating a PSK modulated signal and wherein the transmitter is crystal based. A crystal based receiver receives the PSK modulated signal and the delta phase between the recovered PSK signal and a receiver generated reference signal is measured; the measurement is repeated with a predetermined phase shift. Voltage values are derived representing the results of each of the measurements and are applied to an analog-to-digital converter to derive digital values representing the two phases measured, and a corresponding delta phase. The digital values are applied to a look up table to derive a phase correction for the reference signal, and several methods are described to perform various types of PSK demodulation.
    Type: Application
    Filed: September 24, 2001
    Publication date: March 27, 2003
    Applicant: Finepoint Innovations, Inc.
    Inventors: Russell A. Stillman, Charles A. Waterbury