Patents by Inventor J. David Unger

J. David Unger 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).

  • Transmit pre-equalization in a modem environment
    Patent number: 6879641
    Abstract: The signal distortion present in a transmitted signal is measured and used to generate filter coefficients. The coefficients are stored in memory. A modulator generates an intermediate frequency signal. The modulator inputs the signal to a programmable predistortion filter. The characteristics of the filter are altered by the filter coefficients that have been programmed into the filter. The resulting filtered signal is upconverted to a frequency in a transmit frequency band.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: April 12, 2005
    Assignee: BigBand Networks BAS, Inc.
    Inventor: J. David Unger
  • Transmit pre-equalization in a modem environment
    Publication number: 20030231716
    Abstract: The signal distortion present in a transmitted signal is measured and used to generate filter coefficients. The coefficients are stored in memory. A modulator generates an intermediate frequency signal. The modulator inputs the signal to a programmable predistortion filter. The characteristics of the filter are altered by the filter coefficients that have been programmed into the filter. The resulting filtered signal is upconverted to a frequency in a transmit frequency band.
    Type: Application
    Filed: June 13, 2002
    Publication date: December 18, 2003
    Applicant: ADC Broadband Access Systems, Inc.
    Inventor: J. David Unger
  • System, method and apparatus for coordination of channel quality assessment and ingress filtering in cable modem systems
    Publication number: 20030208775
    Abstract: A system, method and apparatus for coordinating the operation of channel quality assessment and analysis and ingress filtering of an active channel in a cable modem system.
    Type: Application
    Filed: May 3, 2002
    Publication date: November 6, 2003
    Inventors: Harold A. Roberts, J. David Unger
  • Passive CMTS redundancy
    Publication number: 20030101463
    Abstract: Cable modem termination systems (CMTS) having directional couplers in the primary signal path facilitate redundancy without the need for active components, e.g., switches or amplifiers, in the primary signal path. The use of directional couplers in the primary signal path allows a backup CMTS transceiver to provide redundancy to multiple primary CMTS transceivers through the use of switching outside of the primary signal path. Additional directional couplers in the backup signal path may be used to allow testing and maintenance of the backup CMTS transceiver without disturbing the primary signal path.
    Type: Application
    Filed: November 26, 2001
    Publication date: May 29, 2003
    Applicant: ADC Telecommunications, Inc.
    Inventors: Clarke V. Greene, J. David Unger, Andrew R. Boyce
  • Method and apparatus for initialization of a cable modem
    Patent number: 6230326
    Abstract: A method and apparatus for initialization and operation of cable modems comprising initializing the cable modems over management channels and transferring the cable modems to a data channel for operation. Initialization over a management channel overcomes certain prior art constraints associated with initialization over the data channel.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: May 8, 2001
    Assignee: Nortel Networks Limited
    Inventors: J. David Unger, John Ulm, Eugene E. O'Neil, Jr., Wilson Sawyer