Patents by Inventor David J. Pearce

David J. Pearce 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).

  • Patent number: 8068748
    Abstract: A method and system to sense an amount of material such as toner in a container held in a horizontal position within a machine, such as a printing machine. A level sensor senses an amount of material within a dispensing unit which causes the level sensor to issue a signal. The dispensing unit is external to the container. The container holding the material is rotated, and a rotation direction reversed to a direction normally used to dispense the material. The reverse rotation direction moves the material to a closed end of the container. The container is then moved in a forward direction following the rotation of the container in the reverse direction. The forward rotation moves the material to the open end of the container, and the material further moves into the dispensing unit. A signal is generated when a sufficient amount of material has been moved into the dispensing unit.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: November 29, 2011
    Assignee: Xerox Corporation
    Inventors: David J. Pearce, Martin R. Walsh
  • Patent number: 8046219
    Abstract: A system, method, and apparatus for separating speech signal from a noisy acoustic environment. The separation process may include directional filtering, blind source separation, and dual input spectral subtraction noise suppressor. The input channels may include two omnidirectional microphones whose output is processed using phase delay filtering to form speech and noise beamforms. Further, the beamforms may be frequency corrected. The omnidirectional microphones generate one channel that is substantially only noise, and another channel that is a combination of noise and speech. A blind source separation algorithm augments the directional separation through statistical techniques. The noise signal and speech signal are then used to set process characteristics at a dual input noise spectral subtraction suppressor (DINS) to efficiently reduce or eliminate the noise component. In this way, the noise is effectively removed from the combination signal to generate a good qualify speech signal.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: October 25, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Robert A. Zurek, Jeffrey M. Axelrod, Joel A. Clark, Holly L. Francois, Scott K. Isabelle, David J. Pearce, James A. Rex
  • Publication number: 20090263146
    Abstract: A method and system to sense an amount of material such as toner in a container held in a horizontal position within a machine, such as a printing machine. A level sensor senses an amount of material within a dispensing unit which causes the level sensor to issue a signal. The dispensing unit is external to the container. The container holding the material is rotated, and a rotation direction reversed to a direction normally used to dispense the material. The reverse rotation direction moves the material to a closed end of the container. The container is then moved in a forward direction following the rotation of the container in the reverse direction. The forward rotation moves the material to the open end of the container, and the material further moves into the dispensing unit. A signal is generated when a sufficient amount of material has been moved into the dispensing unit.
    Type: Application
    Filed: April 16, 2008
    Publication date: October 22, 2009
    Applicant: XEROX CORPORATION
    Inventors: David J. Pearce, Martin R. Walsh
  • Publication number: 20090106021
    Abstract: A system, method, and apparatus for separating speech signal from a noisy acoustic environment. The separation process may include directional filtering, blind source separation, and dual input spectral subtraction noise suppressor. The input channels may include two omnidirectional microphones whose output is processed using phase delay filtering to form speech and noise beamforms. Further, the beamforms may be frequency corrected. The omnidirectional microphones generate one channel that is substantially only noise, and another channel that is a combination of noise and speech. A blind source separation algorithm augments the directional separation through statistical techniques. The noise signal and speech signal are then used to set process characteristics at a dual input noise spectral subtraction suppressor (DINS) to efficiently reduce or eliminate the noise component. In this way, the noise is effectively removed from the combination signal to generate a good qualify speech signal.
    Type: Application
    Filed: October 18, 2007
    Publication date: April 23, 2009
    Applicant: Motorola, Inc.
    Inventors: Robert A. ZUREK, Jeffrey M. AXELROD, Joel A. CLARK, Holly L. FRANCOIS, Scott K. ISABELLE, David J. PEARCE, James A. REX