Patents by Inventor Hing “Ada” T. Hung

Hing “Ada” T. Hung 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).

  • Technique for minimizing decision feedback equalizer wordlength in the presence of a DC component
    Patent number: 7277481
    Abstract: A system for reducing the complexity of an adaptive decision feedback equalizer, for use in connection with a dual-mode QAM/VSB receiver system is disclosed. QAM and VSB symbols, which are expressed in two's compliment notation, include an extra bit required to compensate for a fixed offset term introduced by the two's compliment numbering system. A decision feedback equalizer includes a decision feedback filter section which operates on symbolic decisions represented by a wordlength which excludes the added bit representing the offset. The vestigal word is convolved with the decision feedback filter's coefficients, while a DC component, corresponding to the excluded bit, is convolved with the same coefficient values in a correction filter. The two values are summed to provide an ISI compensation signal at the input of a decision device such as a slicer. A DC component representing a pilot tone in VSB transmission systems also introduces a DC component, and additional bits, to a VSB wordlength.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: October 2, 2007
    Assignee: Broadcom Corporation
    Inventors: Loke Kun Tan, Tian-Min Liu, Hing “Ada” T. Hung
  • Technique for minimizing decision feedback equalizer wordlength in the presence of a DC component
    Patent number: 6226323
    Abstract: A system for reducing the complexity of an adaptive decision feedback equalizer, for use in connection with a dual-mode QAM/VSB receiver system is disclosed. QAM and VSB symbols, which are expressed in two's compliment notation, include an extra bit required to compensate for a fixed offset term introduced by the two's compliment numbering system. A decision feedback equalizer includes a decision feedback filter section which operates on symbolic decisions represented by a wordlength which excludes the added bit representing the offset. The vestigal word is convolved with the decision feedback filter's coefficients, while a DC component, corresponding to the excluded bit, is convolved with the same coefficient values in a correction filter. The two values are summed to provide an ISI compensation signal at the input of a decision device such as a slicer. A DC component representing a pilot tone in VSB transmission systems also introduces a DC component, and additional bits, to a VSB wordlength.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: May 1, 2001
    Assignee: Broadcom Corporation
    Inventors: Loke Kun Tan, Tian-Min Liu, Hing “Ada” T. Hung