Patents by Inventor Michael Alan Soderstrand

Michael Alan Soderstrand 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).

  • Adaptive removal of resonance-induced noise
    Patent number: 6611602
    Abstract: Noise is removed from the digitized output of a sensor, subject to undesired resonance, even when the resonant frequency is unknown or drifts, with sufficiently low phase delay for the sensor to be used in closed-loop control. A very narrow notch filter which removes the resonance-induced noise is recursive (IIR) and therefore has a low phase delay. However, the apparatus which determines the center frequency of the notch filter is non-recursive, and therefore stable. It includes a tunable FIR filter which tracks the same resonance that we wish the IIR filter to remove. Tuning the FIR filter to minimize the output of the FIR filter therefore tunes the notch frequency to align with the resonant frequency. The tuning parameter which adaptively produces this result is suitably scaled and biased, and is applied to the IIR filter.
    Type: Grant
    Filed: June 2, 1999
    Date of Patent: August 26, 2003
    Assignees: The Regents of the University of California, The Boeing Company
    Inventors: Stanley A. White, Jeffrey P. Woodard, Michael Alan Soderstrand, Karl Einar Nelson, Phong Vu Nguyen Dao
  • Adaptive removal of resonance-induced noise
    Patent number: 5960091
    Abstract: Noise is removed from the digitized output of a sensor, subject to undesired resonance, even when the resonant frequency is unknown or drifts, with sufficiently low phase delay for the sensor to be used in closed-loop control. A very narrow notch filter which removes the resonance-induced noise is recursive (IIR) and therefore has a low phase delay. However, the apparatus which determines the center frequency of the notch filter is non-recursive, and therefore stable. It includes a tunable FIR filter which tracks the same resonance that we wish the IIR filter to remove. Tuning the FIR filter to minimize the output of the FIR filter therefore tunes the notch frequency to align with the resonant frequency. The tuning parameter which adaptively produces this result is suitably scaled and biased, and is applied to the IIR filter.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: September 28, 1999
    Inventors: Stanley A. White, Jeffrey P. Woodard, Michael Alan Soderstrand, Karl Einar Nelson, Phong Vu Nguyen Dao