Patents by Inventor Michael Joseph McLaughlin

Michael Joseph McLaughlin 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).

  • Noise suppression
    Patent number: 7283956
    Abstract: A method and apparatus for noise suppression is described herein. The channel gain is controlled based on a degree of variability of the background noise. The noise variability estimate is used in conjunction with a variable attenuation concept to produce a family of gain curves that are adaptively suited for a variety of combinations of long-term peak SNR and noise variability. More specifically, a measure of the variability of the background noise is used to provide an optimized threshold that reduces the occurrence of non-stationary background noise entering into the transition region of the gain curve.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: October 16, 2007
    Assignee: Motorola, Inc.
    Inventors: James Patrick Ashley, Tenkasi Vaideeswaran Ramabadran, Michael Joseph McLaughlin
  • Modified Tomlinson-Harashima precoding method circuit for infinite impulse response (IIR) channels
    Patent number: 7133465
    Abstract: A precoding circuit for minimizing distortion of an input signal in a communication channel having a compound transfer function in the Z-Domain: H(z)=(1+a1.z?1+a2.z?2+a3.z31 3+ . . . +an.z?n)/(1+b1.z?+b2.z?2+b?3.z?3+ . . . +bp.z?p). A feedback circuit comprises a first FIR filter and a transfer function corresponding to the inverse of a feedforward part of a transfer function of the communication channel. A feedforward circuit comprises a second FIR filter and a transfer function corresponding to the inverse of a feedback part of a transfer function of the communication channel. A first subtracting circuit subtracts a feedback signal of the feedback circuit from a feedforward signal of the feedforward circuit and outputs a difference signal which is added to a transmit end signal by a first adding circuit.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: November 7, 2006
    Assignee: Inter-Tel, Inc.
    Inventor: Michael Joseph McLaughlin
  • Noise suppression
    Publication number: 20040052384
    Abstract: A method and apparatus for noise suppression is described herein. The channel gain is controlled based on a degree of variability of the background noise. The noise variability estimate is used in conjunction with a variable attenuation concept to produce a family of gain curves that are adaptively suited for a variety of combinations of long-term peak SNR and noise variability. More specifically, a measure of the variability of the background noise is used to provide an optimized threshold that reduces the occurrence of non-stationary background noise entering into the transition region of the gain curve.
    Type: Application
    Filed: September 18, 2002
    Publication date: March 18, 2004
    Inventors: James Patrick Ashley, Tenkasi Vaideeswaran Ramabadran, Michael Joseph McLaughlin
  • Modified Tomlinson-Harashima precoding method circuit for infinite impulse response (IIR) channels
    Publication number: 20030123569
    Abstract: A precoding circuit (20) for minimising distortion of an input data signal of range 1 + M 2 ⁢   ⁢ to ⁢   - M 2
    Type: Application
    Filed: November 8, 2002
    Publication date: July 3, 2003
    Inventor: Michael Joseph McLaughlin