Patents by Inventor Nils Lofgren

Nils Lofgren 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 filtering system and method
    Patent number: 6487295
    Abstract: A signal filter includes a first adaptive filter receiving a desired signal containing a noise component and a first noise correlated reference signal, and outputting a first filtered output signal. A second adaptive filter, receives the desired signal containing the noise component and a second noise correlated reference signal and outputs a second filtered output signal. Signal filter parameters of the second adaptive filter are controlled based on the first filtered output signal and the second filtered output signal.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: November 26, 2002
    Assignee: Ortivus AB
    Inventors: Nils Lofgren, Per Karlsson, Gunilla Lundahl, Fredrik Lundqvist