Patents by Inventor Louis W. Hiener, III

Louis W. Hiener, III 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).

  • Telephony test system with adjustable output impedance
    Patent number: 6285744
    Abstract: A telephone test system (2) includes a controller (4), a programmable gate array (PGA) (24) and a digital signal processor (DSP) (26) connected by a common bus (20). The PGA (24) includes an output connected to an input of a digital-to-analog converter (DAC) (36) and input connected to an output of an analog-to-digital converter (ADC) (32). A driver circuit (46) is connected between the DAC (36) and a telephone circuit (60) and between the ADC (32) and the telephone circuit (60). Under the control of the DSP (26), the driver circuit (46) generates voltages to the telephone circuit (60) and samples the response of the telephone circuit (60) to such generated voltages. The driver circuit (46) includes control inputs for receiving from the PGA (24) an impedance adjust signal (D) and a resistance adjust signal (R). An output impedance (124) of the driver circuit (46) connected to the telephone circuit (60) is adjustable as a function of the impedance adjust signal (D) and/or the resistance adjust signal (R).
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: September 4, 2001
    Assignee: Tollgrade Communications, Inc.
    Inventors: Regis J. Nero, Jr., Louis W. Hiener, III, Richard A. Bair, Jr., Frederick J. Kiko, Leo W. Manuel, II, Lester Mintzer