Patents by Inventor Martin H. Dost

Martin H. Dost 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).

  • Compound pulse dimming circuitry for conditioning readback signals
    Patent number: 4875112
    Abstract: A pulse signal conditioner filters and equalizes signal pulses representing digital data whether or not obtained from a magnetic recording device. Modified low pass filters filter the pulse signals and also derive and feed forward the second time derivative of the filtered pulse signals. The filtered pulse and the second time derivative thereof are combined to slim the pulse. Further slimming is provided by delay line equalizers having three paths. A first path for attenuating the pulse signals, a second path for delaying the pulse signals for a first delay, and a third path for delaying the pulse signals for a second delay and attenuation. Pulse signals from the three paths are combined to further slim the pulse.
    Type: Grant
    Filed: December 31, 1985
    Date of Patent: October 17, 1989
    Assignee: International Business Machines Corporation
    Inventors: Martin H. Dost, Emil Hopner, Constantin M. Melas, Lionel D. Provazek
  • Servo encodement and detection system using tetra-orthogonal servo pattern
    Patent number: 4490756
    Abstract: A track-seeking and track-following servo encodement and detection system employs a servo pattern using a reference signal and control signals, the control signals having an orthogonal phase relationship to each other by cyclically revolving in phase by 90.degree., 180.degree., 270.degree., and repeating this pattern every four tracks.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: December 25, 1984
    Assignee: International Business Machines Corporation
    Inventors: Martin H. Dost, Chung C. Liu, Francis E. Mueller