Patents by Inventor David B. Hartman

David B. Hartman 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: 7937640
    Abstract: Methods are disclosed for maintaining a quality video stream in Internet Protocol (IP) mode include dynamically adjusting IP packet-loss periods and loss distances between IP packet-loss events.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: May 3, 2011
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Pierre Costa, Ahmad C. Ansari, David B. Hartman, Vernon D. Reed
  • Patent number: 7908627
    Abstract: A system and method are disclosed for providing a unified video data stream for diverse receiving platforms. In some embodiments, the unified data stream can provide video data to multiple receiving devices with diverse video data input requirements. The communication system can include a digitizer that converts an analog video to a high resolution (HR) digital video signal. The communication system can also include a signal processing engine that receives the HR digital video signal, compress the video signal, creates video packets from the compressed signal, and identifies at least a portion of the video packets for distribution to lower resolution devices. The HR data stream can be sent to high resolution devices wherein the identified packets can be “copied” from the HR data stream and sent to devices having lower resolution requirements.
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: March 15, 2011
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Ahmad C. Ansari, Dinesh Nadarajah, David B. Hartman
  • Patent number: 7849384
    Abstract: The present disclosure is directed to a system and method of correcting video data errors. In a particular embodiment, the method includes receiving a stream of data packets at a re-generator of an Internet Protocol (IP) video transport stream. The stream of data packets includes a plurality of IP media packets and a plurality of forward error correction (FEC) packets. The method also includes determining an error profile of an error within the plurality of IP media packets. The method includes identifying one of the plurality of FEC packets, where the identified FEC packet is associated with an error correction code corresponding to the error profile. The method also includes selecting an inverse FEC function from a plurality of inverse FEC functions. The selected inverse FEC function corresponds to the identified FEC packet.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: December 7, 2010
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Pierre Costa, Ahmad Ansari, David B. Hartman, Brad Allen Medford
  • Publication number: 20090271683
    Abstract: The present disclosure is directed to a system and method of correcting video data errors. In a particular embodiment, the method includes receiving a stream of data packets at a re-generator of an Internet Protocol (IP) video transport stream. The stream of data packets includes a plurality of IP media packets and a plurality of forward error correction (FEC) packets. The method also includes determining an error profile of an error within the plurality of IP media packets. The method includes identifying one of the plurality of FEC packets, where the identified FEC packet is associated with an error correction code corresponding to the error profile. The method also includes selecting an inverse FEC function from a plurality of inverse FEC functions. The selected inverse FEC function corresponds to the identified FEC packet.
    Type: Application
    Filed: July 8, 2009
    Publication date: October 29, 2009
    Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Pierre Costa, Ahmad Ansari, David B. Hartman, Brad Allen Medford
  • Patent number: 7577898
    Abstract: The present disclosure is directed to a system and method of correcting video data errors. In a particular embodiment, the method includes receiving a plurality of Internet Protocol (IP) video data packets at a generator of a video acquisition system. The method also includes calculating a first error correction code corresponding to a first error profile and generating a first forward error correction (FEC) packet to produce the first error correction code. The method also includes calculating a second error correction code corresponding to a second error profile and generating a second FEC packet to produce the second error correction code.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: August 18, 2009
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Pierre Costa, Ahmad Ansari, David B. Hartman, Brad Allen Medford
  • Publication number: 20080148329
    Abstract: Methods are disclosed for maintaining a quality video stream in Internet Protocol (IP) mode include dynamically adjusting IP packet-loss periods and loss distances between IP packet-loss events.
    Type: Application
    Filed: December 18, 2006
    Publication date: June 19, 2008
    Inventors: Pierre Costa, Ahmad C. Ansari, David B. Hartman, Vernon D. Reed
  • Publication number: 20040221324
    Abstract: A digital display monitor module (DDMM) has a display device to display video provided thereto. An interactive network module (INM) removably interfaces with the DDMM to provide the video signals to the DDMM. The INM comprises an input interface and a programmable conditional access system (PCAS) to enable conditional access to at least one premium television service received by the input interface. The PCAS is programmable by at least two different service providers.
    Type: Application
    Filed: June 27, 2003
    Publication date: November 4, 2004
    Applicant: SBC, Inc.
    Inventors: Ahmad C. Ansari, David B. Hartman