Patents Assigned to U.S. Robotics Corp.
  • Systems and methods for optimizing timing phase in modem devices
    Patent number: 8855255
    Abstract: Systems and methods are provided for performing the required phase calculation in a telecommunications system in order to optimize system performance more quickly and with reduced complexity as compared to prior approaches to solving this problem. In accordance with the preferred exemplary embodiment of the present invention, the phase delay of the precursor equalizer (EQ) is calculated off-line and as a result it is not necessary to fill the precursor EQ delay line with the indicated number of symbols as in the previous approach. Additionally, because the precursor EQ is fractionally spaced, both sine and cosine values of the 4kHz tone's initial phase can be achieved simultaneously. As a result, only 36 quick timing sequence (QTS) symbols are needed in order to perform the required estimation.
    Type: Grant
    Filed: March 29, 2002
    Date of Patent: October 7, 2014
    Assignee: U.S. Robotics Corp.
    Inventors: Qing Chen, Qian Cheng
  • Transparent support of protocol and data compression features for data communication
    Patent number: 5768525
    Abstract: A method for efficiently setting up a data transmission session over a communication channel between a local endpoint application and a network endpoint application with a proxy engine in a manner that is transparent to the user. The proxy engine is placed in simultaneous communication sessions with the local endpoint application and the network endpoint application. The proxy engine determines the network control protocols that are supported by both the network endpoint application and the local endpoint application. The proxy engine enables the network control protocols that are supported by both the network endpoint application and the local endpoint application. Optionally, the proxy engine enables data compression techniques that are supported by both the network endpoint application and the proxy engine.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: June 16, 1998
    Assignee: U.S. Robotics Corp.
    Inventors: Joseph D. Kralowetz, Douglas F. Ortega
  • Transparent support of protocol and data compression features for data communication
    Patent number: 5657452
    Abstract: A method for efficiently setting up a data transmission session over a communication channel between a local endpoint application and a network endpoint application with a proxy engine in a manner that is transparent to the user. The proxy engine is placed in simultaneous communication sessions with the local endpoint application and the network endpoint application. The proxy engine determines the network control protocols that are supported by both the network endpoint application and the local endpoint application. The proxy engine enables the network control protocols that are supported by both the network endpoint application and the local endpoint application. Optionally, the proxy engine enables data compression techniques that are supported by both the network endpoint application and the proxy engine.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: August 12, 1997
    Assignee: U.S. Robotics Corp.
    Inventors: Joseph D. Kralowetz, Douglas F. Ortega