Patents by Inventor Wallace F. Smith
Wallace F. Smith 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).
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Patent number: 9485352Abstract: A system and method for recording analog signals exchanged between a telephone device and a VoIP device, capturing packets exchanged between the VoIP device and an IP network, determining analog time values corresponding to analog characteristics of the analog signals, determining digital time values corresponding to digital characteristics of the packets, determining a common reference time for the analog time values and digital time values and determining a processing delay based on the analog time values and the digital time values.Type: GrantFiled: September 23, 2015Date of Patent: November 1, 2016Assignee: AT & T Intellectual Property I, L.P.Inventors: David Ramsden, Wallace F. Smith
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Publication number: 20160014269Abstract: A system and method for recording analog signals exchanged between a telephone device and a VoIP device, capturing packets exchanged between the VoIP device and an IP network, determining analog time values corresponding to analog characteristics of the analog signals, determining digital time values corresponding to digital characteristics of the packets, determining a common reference time for the analog time values and digital time values and determining a processing delay based on the analog time values and the digital time values.Type: ApplicationFiled: September 23, 2015Publication date: January 14, 2016Inventors: David RAMSDEN, Wallace F. SMITH
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Patent number: 9160842Abstract: A system and method for recording analog signals exchanged between a telephone device and a VoIP device, capturing packets exchanged between the VoIP device and an IP network, determining analog time values corresponding to analog characteristics of the analog signals, determining digital time values corresponding to digital characteristics of the packets, determining a common reference time for the analog time values and digital time values and determining a processing delay based on the analog time values and the digital time values.Type: GrantFiled: August 5, 2013Date of Patent: October 13, 2015Assignee: AT&T INTELLECTUAL PROPERTY I, LP.Inventors: David Ramsden, Wallace F. Smith
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Patent number: 9008326Abstract: The performance of an echo canceller is assessed using a) a test signal launched from originating test equipment and b) a simulated echo of the test signal launched from terminating test equipment. The launch of the simulated echo signal is timed in such a way that it arrives at the tandem echo canceller(s) at a particular point in time relative to the arrival of the test signal, at the tandem echo canceller(s), when the tandem echo canceller(s) is (are) not able to cancel the simulated echo signal. The latter thus arrives uncanceled at the target echo canceller. The launch of the simulated echo signal is further timed in such a way that it arrives at the target echo canceller at a point in time relative to the arrival of the test signal, at the target echo canceller, when the target echo canceller is able to cancel the simulated echo signal.Type: GrantFiled: October 15, 2012Date of Patent: April 14, 2015Assignee: AT&T Intellectual Property I, L.P.Inventors: James H. James, Wallace F. Smith, Jr.
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Publication number: 20130322282Abstract: A system and method for recording analog signals exchanged between a telephone device and a VoIP device, capturing packets exchanged between the VoIP device and an IP network, determining analog time values corresponding to analog characteristics of the analog signals, determining digital time values corresponding to digital characteristics of the packets, determining a common reference time for the analog time values and digital time values and determining a processing delay based on the analog time values and the digital time values.Type: ApplicationFiled: August 5, 2013Publication date: December 5, 2013Applicant: AT & T Intellectual Property I, LP.Inventors: David RAMSDEN, Wallace F. Smith
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Patent number: 8503311Abstract: A system and method for recording analog signals exchanged between a telephone device and a VoIP device, capturing packets exchanged between the VoIP device and an IP network, determining analog time values corresponding to analog characteristics of the analog signals, determining digital time values corresponding to digital characteristics of the packets, determining a common reference time for the analog time values and digital time values and determining a processing delay based on the analog time values and the digital time values.Type: GrantFiled: December 5, 2008Date of Patent: August 6, 2013Assignee: AT & T Intellectual Property I, L.P.Inventors: David Ramsden, Wallace F. Smith
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Patent number: 8391126Abstract: 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: GrantFiled: December 17, 2009Date of Patent: March 5, 2013Assignee: AT&T Intellectual Property I, L.P.Inventors: James James, David B. Ramsden, Wallace F. Smith
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Patent number: 8295501Abstract: The performance of an echo canceller is assessed using a) a test signal launched from originating test equipment and b) a simulated echo of the test signal launched from terminating test equipment. The launch of the simulated echo signal is timed in such a way that it arrives at the tandem echo canceller(s) at a particular point in time relative to the arrival of the test signal, at the tandem echo canceller(s), when the tandem echo canceller(s) is (are) not able to cancel the simulated echo signal. The latter thus arrives uncanceled at the target echo canceller. The launch of the simulated echo signal is further timed in such a way that it arrives at the target echo canceller at a point in time relative to the arrival of the test signal, at the target echo canceller, when the target echo canceller is able to cancel the simulated echo signal.Type: GrantFiled: December 15, 2008Date of Patent: October 23, 2012Assignee: AT&T Intellectual Property I, L.P.Inventors: James H James, Wallace F. Smith, Jr.
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Publication number: 20110149815Abstract: 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: ApplicationFiled: December 17, 2009Publication date: June 23, 2011Inventors: James James, David B. Ramsden, Wallace F. Smith
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Patent number: 7899639Abstract: A system that incorporates teachings of the present disclosure may include, for example, an echo measurement device having a controller to transmit a test signal in a communication path which is looped back at an end point identified as having an echo problem. The test signal can be transmitted at a remote location from the end point. The test signal can be represented by a limited burst signal of one or more frequencies operating outside a range of an operating frequency of an echo canceller deactivation signal transmitted in the communication path. Additional embodiments are disclosed.Type: GrantFiled: February 27, 2009Date of Patent: March 1, 2011Assignee: AT&T Intellectual Property I, LP.Inventors: Wallace F. Smith, James Herbert James, David Beaumont Ramsden
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Publication number: 20100150363Abstract: The performance of an echo canceller is assessed using a) a test signal launched from originating test equipment and b) a simulated echo of the test signal launched from terminating test equipment. The launch of the simulated echo signal is timed in such a way that it arrives at the tandem echo canceller(s) at a point in time relative to the arrival of the test signal thereat that the tandem echo canceller(s) is (are) not able to cancel the simulated echo signal. The latter thus arrives uncanceled at the target echo canceller. The launch of the simulated echo signal is further timed in such a way that it arrives at the target echo canceller at a point in time relative to the arrival of the test signal thereat that the target echo canceller IS able to cancel the simulated echo signal. As a result, any residual echo received at the originating test equipment is a measure of the performance of the target echo canceller exclusive of the performance of the tandem echo canceller(s).Type: ApplicationFiled: December 15, 2008Publication date: June 17, 2010Inventors: James H. James, Wallace F. Smith, JR.
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Publication number: 20100142513Abstract: A system and method for recording analog signals exchanged between a telephone device and a VoIP device, capturing packets exchanged between the VoIP device and an IP network, determining analog time values corresponding to analog characteristics of the analog signals, determining digital time values corresponding to digital characteristics of the packets, determining a common reference time for the analog time values and digital time values and determining a processing delay based on the analog time values and the digital time values.Type: ApplicationFiled: December 5, 2008Publication date: June 10, 2010Inventors: David Ramsden, Wallace F. Smith
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Patent number: 7516033Abstract: 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: GrantFiled: June 23, 2006Date of Patent: April 7, 2009Assignee: AT&T Intellectual Property I, L.P.Inventors: Wallace F. Smith, James H. James, David B. Ramsden
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Patent number: 7251213Abstract: A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can be subtracted from the overall echo duration to compute the echo path delay.Type: GrantFiled: September 17, 2002Date of Patent: July 31, 2007Assignee: AT&T Corp.Inventors: Bing Chen, Wallace F. Smith, Jr.
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Patent number: 7003098Abstract: A method and system for measuring the signal transmission time through a network link bounded by at least one echo canceller. The method generally includes the steps of determining a signal transmission time (tA) along a network path including the network link bounded by the echo canceller between a first endpoint and a second endpoint, transmitting a test signal from the first endpoint to the second endpoint through the network path, transmitting an echo signal which simulates the test signal from the second endpoint to the first endpoint through the network path, measuring a minimum time delay between transmission of the test signal and transmission of the echo signal which causes the echo canceller to cancel the echo signal and calculating the signal transmission time through the network link bounded by the echo canceller based on the measured minimum time delay and the determined network path signal transmission time (tA).Type: GrantFiled: December 17, 2003Date of Patent: February 21, 2006Assignee: AT&T Corp.Inventor: Wallace F. Smith
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Publication number: 20040228473Abstract: A method and system for measuring the signal transmission time through a network link bounded by at least one echo canceller. The method generally includes the steps of determining a signal transmission time (tA) along a network path including the network link bounded by the echo canceller between a first endpoint and a second endpoint, transmitting a test signal from the first endpoint to the second endpoint through the network path, transmitting an echo signal which simulates the test signal from the second endpoint to the first endpoint through the network path, measuring a minimum time delay between transmission of the test signal and transmission of the echo signal which causes the echo canceller to cancel the echo signal and calculating the signal transmission time through the network link bounded by the echo canceller based on the measured minimum time delay and the determined network path signal transmission time (tA).Type: ApplicationFiled: December 17, 2003Publication date: November 18, 2004Applicant: AT& T CorporationInventor: Wallace F. Smith
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Publication number: 20040052220Abstract: A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can be subtracted from the overall echo duration to compute the echo path delay.Type: ApplicationFiled: September 17, 2002Publication date: March 18, 2004Applicant: AT&T Corp.Inventors: Bing Chen, Wallace F. Smith