Patents by Inventor David B. Ramsden

David B. Ramsden 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).

  • Method and apparatus for providing echo cancellation in a network
    Patent number: 8391126
    Abstract: A method and apparatus for providing echo cancellation are disclosed. For example, the method receives via an echo canceller a first audio signal directed towards an endpoint device, and adds an inserted signal to the first audio signal directed towards the endpoint device. The method determines if a second audio signal being received from the endpoint device comprises the inserted signal, and cancels at least a portion of the second audio signal that is associated with the first audio signal, if the inserted signal is detected.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: March 5, 2013
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: James James, David B. Ramsden, Wallace F. Smith
  • METHOD AND APPARATUS FOR PROVIDING ECHO CANCELLATION IN A NETWORK
    Publication number: 20110149815
    Abstract: A method and apparatus for providing echo cancellation are disclosed. For example, the method receives via an echo canceller a first audio signal directed towards an endpoint device, and adds an inserted signal to the first audio signal directed towards the endpoint device. The method determines if a second audio signal being received from the endpoint device comprises the inserted signal, and cancels at least a portion of the second audio signal that is associated with the first audio signal, if the inserted signal is detected.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 23, 2011
    Inventors: James James, David B. Ramsden, Wallace F. Smith
  • Method and apparatus for identifying echo sources in a communication path
    Patent number: 7516033
    Abstract: A method and apparatus for identifying echo sources in a communication path. A system that incorporates teachings of the present disclosure may include, for example, an echo measurement device (EMD) having a transmit module to transmit an echo canceller deactivation signal in a communication path of the communication system, wherein the echo canceller deactivation signal deactivates one or more echo cancellers in said communication path. The transmit module can also transmit a test signal in the communication path which is looped back at an end point identified as having an echo problem, wherein the test signal is transmitted at a remote location from the end point. The EMD can further include a detection module to detect one or more echo signals associated with the test signal. Additional embodiments are disclosed.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: April 7, 2009
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Wallace F. Smith, James H. James, David B. Ramsden
  • Nonintrusive speech level and dynamic noise measurements
    Patent number: 5216702
    Abstract: A digital signal processor is provided with the facility to measure accurately, and nonintrusively, the levels of noise and/or speech signals appearing on an in-service network connection.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: June 1, 1993
    Assignee: AT&T Bell Laboratories
    Inventor: David B. Ramsden