Patents by Inventor Hans B. Wach

Hans B. Wach 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).

  • Calibration of tracking error signal gain in a tracking servo system
    Publication number: 20020110057
    Abstract: A calibration for a tracking error signal gain in a tracking servo system of an optical disk drive is presented. The calibration determines the peak-to-peak tracking error signal when the tracking servo system is open, calculates a gain factor in response to the peak-to-peak tracking error signal, and calculates a new tracking error signal gain based on the tracking error signal gain and the gain factor. New tracking error signal gains are calculated until the gain factor is approximately one.
    Type: Application
    Filed: September 10, 2001
    Publication date: August 15, 2002
    Inventors: Ron J. Kadlec, Charles R. Watt, Hans B. Wach, Christopher J. Turner
  • Digital servo system with feed-forward control loops
    Publication number: 20020097643
    Abstract: A tracking servo system with a feed-forward control loop is presented. Periodic variations in a control signal can be detected. These periodic variations can be added into the control signal to form a new control signal so that on subsequent cycles the control signal does not include the periodic variations.
    Type: Application
    Filed: September 10, 2001
    Publication date: July 25, 2002
    Inventors: Ron J. Kadlec, Charles R. Watt, Hans B. Wach