Patents by Inventor Shwu-Liang Luke Hsieh

Shwu-Liang Luke Hsieh 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).

  • DTMF signal detection/removal using adaptive filters
    Patent number: 5889851
    Abstract: An input digital sample containing voice and DTMF signal is used as an input to an adaptive filter. The output signal of the adaptive filter is used to generate a residue from the difference between the input sample and the output signal. The residue signal is used to update the coefficients of the adaptive filter. Upon the convergence of the adaptive filter, the residue signal comprises voice reduced DTMF signal while the adaptive filter's output signal contains the detected DTMF signal.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: March 30, 1999
    Assignee: Lucent Technologies Inc.
    Inventor: Shwu-Liang Luke Hsieh
  • Analog and mixed signal device tester
    Patent number: 5744969
    Abstract: Analog and mixed signal integrated circuits are tested using the modified Volterra series to model the integrated circuit being tested. An adaptive algorithm, for example, least mean square or Kalman, is used to determine to coefficients of the Volterra series. The coefficients are then used to calculate the THD and SNR.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: April 28, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: Andrew Grochowski, Shwu-Liang Luke Hsieh