Patents by Inventor Michael A. Sowell

Michael A. Sowell 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).

  • Software controlled adaptive delta modulator
    Patent number: 5457714
    Abstract: A delta modulator automatically adjusting the slewing rate is disclosed. In the absence of a transition in the output data of a delta modulator, a parameter used for the integrator of the delta modulator is increased. When the comparator of the modulator indicates that the feedback signal of the modulator has overshot the input signal, the parameter is decreased or reversed until the two signals are approximately equal as signalled by a 50% duty cycle.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: October 10, 1995
    Assignee: Wavephore, Inc.
    Inventors: Melvyn Engel, Michael D. Bethel, Michael J. Smith, Michael A. Sowell
  • Digitally controlled adaptive slew rate delta modulator
    Patent number: 5208595
    Abstract: A delta modulator automatically adjusting the slewing rate is disclosed. In the absence of a transition in the output data of a delta modulator, the current used for the integrator of the delta modulator is increased. When the comparator of the modulator indicates that the feedback signal of the modulator has overshot the input signal, the current is decreased or reversed until the two signals are approximately equal as signalled by a 50% duty cycle.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: May 4, 1993
    Assignee: WavePhore, Inc.
    Inventors: Melvyn Engel, Michael A. Sowell, Michael D. Bethel