Patents Assigned to National Data Corporation
  • Patent number: 4489438
    Abstract: The system receives line signals including tone coded information request messages from a telephone line and transmits synthesized human voice response messages along the same line. The system comprises a programmed computer, a processing section connected to the telephone line to receive signals from the telephone line, and an interface circuit for providing communication between the processing section and the computer. A plurality of processing sections are used with a plurality of telephone lines, with only one interface circuit being used to provide communication between all of the processing sections and the computer. Each processing section contains a voice synthesizer circuit, a line control circuit, and a tone decoder circuit. Each of these circuits provides a status signal when the circuit must communicate with the computer. The interface circuit includes an interrupt circuit which receives the status signals and provides an interrupt signal to the computer.
    Type: Grant
    Filed: February 1, 1982
    Date of Patent: December 18, 1984
    Assignee: National Data Corporation
    Inventor: Steve A. Hughes
  • Patent number: 3992587
    Abstract: A device that permits local or remote access to data circuits for the purpose of monitoring, testing and performing diagnostics. It may be used to issue commands to perform various functions whereby the device couples a given circuit to a telephone line in response to coded signals identifying the device and the circuit to be interrogated.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: November 16, 1976
    Assignee: National Data Corporation
    Inventors: Dennis E. Puckett, Dale A. Heatherington, Eugene C. Jones