Patents by Inventor Mark D. Warne

Mark D. Warne 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).

  • Self-equalization method for partial-response maximum-likelihood disk drive systems
    Patent number: 5426541
    Abstract: Apparatus and method for providing equalization adjustment for a filter are provided in a PRML data channel. A first predetermined test pattern is written. Relative error is measured in both magnitude and phase for predetermined frequencies. A relative magnitude ratio for the predetermined frequencies and a phase delay between the predetermined frequencies are identified. A tap set is generated having predefined frequency responses at a plurality of predefined discrete frequencies.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: June 20, 1995
    Assignee: International Business Machines Corporation
    Inventors: Jonathan D. Coker, Richard L. Galbraith, Walter Hirt, David J. Stanek, Mark D. Warne