Patents by Inventor Mark Andrew Alexander

Mark Andrew Alexander 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).

  • Multi-edge pulse width modulator with non-stationary residue assignment
    Patent number: 8306106
    Abstract: An improved method for generating pulse width modulated signals, e.g., for use in audio amplifiers, power amplifiers, etc. An input digital value is received and divided by a number N, producing a quotient and a residue. A plurality N of edge modulation values may then be generated based on the quotient and the residue. Each of the N edge modulation values specifies an edge of the pulse width modulated signal to be generated. Generation of the N edge modulation values may comprise applying the residue to one or more of the N edge modulation values when the residue is greater than zero. The residue may be applied to different ones of the plurality N of edge modulation values during different iterations of the method in a non-stationary fashion. The pulse width modulated signal may then be generated based on the N edge modulation values.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: November 6, 2012
    Assignee: Equiphon, Inc.
    Inventors: Mark Andrew Alexander, Douglas Edward Heineman
  • Multi-Edge Pulse Width Modulator with Non-Stationary Residue Assignment
    Publication number: 20110261875
    Abstract: An improved method for generating pulse width modulated signals, e.g., for use in audio amplifiers, power amplifiers, etc. An input digital value is received and divided by a number N, producing a quotient and a residue. A plurality N of edge modulation values may then be generated based on the quotient and the residue. Each of the N edge modulation values specifies an edge of the pulse width modulated signal to be generated. Generation of the N edge modulation values may comprise applying the residue to one or more of the N edge modulation values when the residue is greater than zero. The residue may be applied to different ones of the plurality N of edge modulation values during different iterations of the method in a non-stationary fashion. The pulse width modulated signal may then be generated based on the N edge modulation values.
    Type: Application
    Filed: May 28, 2010
    Publication date: October 27, 2011
    Inventors: Mark Andrew Alexander, Douglas Edward Heineman